Mobile terms glossary
0 - 9
2G
The name usually given to original GSM, CDMA, and TDMA networks. It uses
the spectrum more efficiently than analog (1G) systems, and offers digital
encryption of conversations. 2G networks introduced data services for mobiles
starting with SMS.
3G
Analog cellular
phones were the first generation while digital marked the second generation.
3G is loosely
defined, but generally includes high data speeds, always-on data access, and
greater voice capacity.
The high data speeds
are possibly the most prominent feature, and certainly the most hyped. They
enable such advanced features as live, streaming video.
There are several
different 3G technology standards. The most prevalent is UMTS, which is based
on WCDMA (the terms WCDMA and UMTS are often used interchangeably).
3GP video
3GP is a simplified
version of the MPEG-4 Part 14 (MP4) container format, designed to decrease
storage and bandwidth requirements in order to accommodate mobile phones. It
stores video streams as MPEG-4 Part 2 or H.263 or MPEG-4 Part 10 (AVC/H.264),
and audio streams as AMR-NB, AMR-WB, AMR-WB+, AAC-LC or HE-AAC.
3GP is designed for
effieciency to make it suitable for Streaming across mobile phone networks and
storing on mobile devices with very littel storage capacity. Video rarely
exceeds a QVGA resolution of 320 x 240 pixels but there are VGA or even D1
resolution exceptions. Audio is usually encoded as either MP3 or AAC-LC (Low
Complexity). Framerates for most mobile devices are Limited to 15fps.
There are two
different standards for this format:
·
3GPP (for
GSM-based Phones, may have filename extension .3gp)
·
3GPP2
(for CDMA-based Phones, may have filename extension .3g2)
Both are based on
MPEG-4 and H.263 video, and AAC or AMR audio.
When transferred to a
computer, 3GP movies can be viewed on Linux, Mac, and Windows platforms with
MPlayer and VLC media player. Programs such as Media Player Classic, Totem,
RealPlayer, QuickTime, and GOM Player can also be used. Some cell phones use
the .mp4 extension for 3GP video.
802.11
802.11 is a set of
IEEE standards for wireless local area networks (WLAN). The most common variant
is 802.11g, which is backwards compatible with the older B variant. 802.11g
devices are sometimes marked as 802.11b/g to indicate this compatibility. There
is a newer version - 802.11n - that provides higher maximum speeds and better
range.
The 802.11g
standard's typical speeds are rated up to 54 Mbps.
A
A-GPS (Assisted GPS)
Assisted GPS (A-GPS)
is used to speed up start-up times of GPS-based positioning systems. GPS may
have problems getting a lock when the signal is weak and in such a case A-GPS
would assist in getting a lock.
This, however, is
achieved by the use of an Assistance Server, so a data connection is required
and charges may apply for the data transfer.
A2DP (Advanced Audio
Distribution Profile)
A2DP is used for streaming
stereo music wirelessly to headphones or speakers over Bluetooth.
Unlike other
Bluetooth profiles (Headset and Handsfree), A2DP is one-way only and streams a
stereo signal.
AAC (Advanced Audio
Coding)
AAC is a file format
for storing digital audio. It's commonly used for storing music on the
Internet, PCs and portable music players and phones.
It is similar to MP3,
but it was designed to be its successor and offers better quality and smaller
file sizes. It also supports DRM, which enforces copyright.
AAC+ and AAC++ are
newer versions of the standard.
Accelerometer
The accelerometer is
a built-in electronic component that measures tilt and motion. It is also
capable of detecting rotation and motion gestures such as swinging or shaking.
The most common use
for it is to activate auto screen rotation on mobile devices when the user
changes their orientation from portrait to landscape or vice-versa.
Another modern
application for the accelerometer is to control the mobile device music player
with gestures (Sony Ericsson Shake control or Samsung Motion play
technologies).
Accelerometers are
also utilized for enriching the gaming controls (navigating by tilting the
device instead of by pressing keys).
Another popular
mobile phone feature based on an accelerometer is turn-to-mute. It allows user
to mute an incoming call, silence an alarm or pause the mobile music player
simply by turning the device face down.
Airplane mode
Please refer to Flight mode.
Alarm Clock
This is a feature
allowing a mobile phone to act like a common alarm clock but with more
flexibility.
Currently, all mobile
phones offer this functionality with varying feature sets. For example, most
devices allow you to set an unlimited number of alarms and set them to repeat
on a daily or weekly basis. Some even allow a customizable snooze period and
with the most advanced devices you can silence an alarm just by turning the
device face down.
Using a favorite FM
radio station as an alarm tone is also an option with some handsets.
Some phones require
the device to be on for the alarm to work while others do not.
Alphanumeric
A string of
characters containing both letters (A-Z) and numbers (0-9).
An alphanumeric text
entry field will accept both letters and numbers. An alphanumeric keypad is one
with both letters and numbers on the keys.
AMOLED display
(Active-matrix organic light-emitting diode)
AMOLED is an emerging
display technology used in portable devices like mobile phones. Active-matrix
OLED displays provide the same performance as their passive-matrix OLED
counterparts, but they consume significantly less power.
This advantage makes
active-matrix OLEDs well suited for portable electronics where battery power
consumption is critical.
Analog
A method of
transmitting information using energy waves. It doesn't have discrete levels
but is a continuously variable wave. Human voice for example is transferred by
directly converting the sound wave to electricity.
Analog cell phones
(known also as 1G) used this technology. However virtually all modern cell
phones use digital signals (2G or later).
Android
Android is a
Linux-based smartphone operating system and software platform created by
Google.
The Android platform
is supported by the Open Handset Alliance and is open source. Any manufacturer
can use Android on their phones and software written for the platform will run
on Android-based devices regardless of manufacturer.
Android competes with
Windows Mobile, S60, and other smartphone platforms.
Antenna
The physical device
used for sending/receiving radio waves. Older phones used external antennas
while most current phones use an internal antenna. The size and shape of the
antenna is designed according to the type of radio waves being used.
APN (Access Point
Name)
APN is the name (web
address) of an access point for GPRS/EDGE/UMTS data connection. Usually
wireless carriers provide the APN to their end users.
Audio jack
A common connector
for plugging in a standard pair of music headphones such as the ones found on
music players, computers and most other electronic devices with audio outputs.
It can support stereo
and/or microphone, depending on the number of separate connector rings on the
jack.
Some phones offer
only a 2.5 mm jack, which is a smaller variety of the same principle.
Headphones supplied
with mobile phones usually have a mic somewhere along the cable and a remote
button that allows for managing calls without using the phone.
Some manufacturers
opt for placing a 3.5mm audio jack on this remote control instead of directly
on the phone itself. The reason for this is that 3.5mm jacks take up quite a
lot of internal space; plus, in this way the user gets to keep the remote
control/mic functionality while using third-party headphones.
Auto-focus
Auto-focus is a
feature of digital cameras that allows them to focus correctly on a subject. It
enhances the quality of the photo over fixed-focus cameras and allows for
close-ups (or the even closer macro shots).
Phones use passive
auto-focus with contrast measurement. This means that the camera needs contrast
to focus and have problems focusing on a blank wall or in low light conditions.
Some phones can use
their camera LEDs as a focus assist light to help deal with the latter case.
AVRCP (Audio/Video
Remote Control Profile)
AVRC is a Bluetooth
profile that allows remote control of media playback on other devices.
Supported functions are play, pause, stop, next, and previous.
It is usually coupled
with A2DP so that, for example, wireless headphones use A2DP to stream the
music and AVRC to control playback.
B
Band
A specific range of
frequencies (for example those between 1850 MHz and 1995 MHz) are called a
band.
Bandwidth
Bandwidth is used to
measure the data throughput of a channel or connection. It's the amount of data
that can be sent over a connection in a given amount of time without
distortion. It should not be confused with band.
Bar
The bar form factor
is the most common and simple form factor for a mobile phone. The body of a bar
phone is one, single block and has no moving parts (aside from the buttons).
"Locking" the keyboard is done to prevent accidental key presses when
the phone is carried in a pocket, purse, etc.
Base Station
A fixed station that
uses radio waves to communicate with mobile devices. It serves as the link
between the user's device and the carrier's network.
Base stations range
in size and area of coverage. Some may cover a radius of several kilometers
while others cover only a few city blocks. Most stations transmit in all
directions but there are also directional antennas aimed at a specific
direction.
Usually base stations
are owned by a single carrier but may offer roaming coverage for other
networks.
Bit
A binary digit. The
values of a bit are either "0" or "1". Eight bits form a
byte.
Bluetooth
Bluetooth is a
wireless protocol for exchanging data over short distances from fixed and
mobile devices, creating personal area networks.
There are two
important parameters of Bluetooth devices - class and supported profiles.
"Class"
signifies the distance at which a Bluetooth connection is possible. Most mobile
devices are Class 2, which means they have a range of up to 10 m. Class 1
devices are rare and have a range of up to 100 feet.
A "profile"
is a type of Bluetooth connection. The most common are the Headset (HSP) and
Handsfree (HFP) profiles that enable the device to connect to a wireless
headset or handsfree.
Some other profiles
are OBEX (OBject EXchange) which allows transfer of files, contacts and events;
A2DP, which adds support for streaming of stereo sound and AVRC, which allows
remote control of playback.
bps (Bits per Second)
A measure of data
transmission speeds, the amount of bits transferred in a single second. Typically,
speeds are measured in kbps (1000 bits per second).
Note: kBps (with a
capital B) denotes bytes per second.
Brand
Not necessarily the
same thing as a manufacturer, as most carriers do not fabricate their own
devices, but rather acquire them from manufacturers and sell them under their
own brand. This is called re-branding.
Broadband
In data
communications, a "broadband connection" is a connection with a high
speed of data transfer (greater than 56 kbps). Generally, it is fast enough to
support streaming video.
Browser
A piece of software
that allows the user to access Internet sites.
Most current handsets
are equipped with browsers capable of viewing common websites (those intended
for a desktop browser).
Web browsers on
budget cellphones may be capable of viewing only websites specially made for
mobile devices. The most advanced devices currently have web browsers with full
Flash support that allows them to play even embedded Flash video (such as the
videos from YouTube).
Byte
A string of 8 bits.
Typically, one byte
equals one character of text but in some cases (especially with non-Latin
alphabets), two or more bytes are used. Because of this, an SMS written in
Cyrillic or Chinese alphabets has shorter maximum length than one written in
the Latin alphabet.
C
Calculator
The basic functions
(addition, subtraction, multiplication, division) are included in all
calculators but some offer more advanced options such as square root or
trigonomic functions.
Some calculators have
the option to convert currency and can calculate mortgage payments.
Calendar
Calendars (also known
as PIM - Personal Information Manager) allow you to store information about
events such as meetings or reminders (e.g. to remind you of someone's
birthday). Usually an alarm can be set to sound an alert.
Some devices offer
the ability to synchronize the calendar with the one on your computer or your
online clendar/task manager.
Call alerts
The mobile phone can
alert you of events such as an incoming call or an incoming message in a number
of ways. The two most popular ones are vibration and ringing.
While vibration is
pretty much self-explanatory, the ringing alerts can be of several types
depending on the mobile phone.
In the past mobile
phones used to allow only monophonic tones to be set as ringing alerts. With
the advancement of technology, polyphonic ringtones also became supported.
Later on as mobile
phones further evolved, they started using MP3 tones for various alert purposes. As more (presumably
superior) audio formats became available (such as AAC), they were also added to the mobile phones' alert
system.
Recently, mobile
phones have even started to use short video clips as call alerts (not to be
confused withvideo calls).
No matter what kind
of ringing tones the mobile phone uses, users have always enjoyed customizing their ringtones by expanding the preset ones supplied by the
manufacturer.
Calling Plan
Services offered by
the wireless service provider as a package. These usually include activation,
monthly charges, per-minute voice call charges, roaming terms, voicemail, data,
and international roaming.
Camera
Some phones feature a
camera that gives them the ability to work as a digital camera. Often (though
not always) the camera is also able to shoot video.
The most important
characteristics of a camera are the resolution (measured in megapixels), lens
focus type (either fixed or automatic) and the presence of a flash. The flash
could be either LED (single or even double) or xenon.
The number of
megapixels is not always a good measurement of the quality of the photos, but
if you plan to print pictures, you would generally get higher quality ones out
of higher megapixel cameras.
Auto focus lens are
not a guarantee of better image quality, but fixed focus cameras are usually
inferior. Most importantly, only auto focus cameras can allow shooting of
really close objects - i.e. macro shooting.
Some phones offer
optical zoom but those are rare. Most use digital zoom, which degrades the
quality of the photo.
Cameras that can work
in "video mode" are characterized by the maximum resolution and
framerate (frames per second or fps) of the recorded video.
Capacitive
Touchscreen
Capacitive touch
sensors are used either as buttons or on touchscreens. They work by sensing the
electrical properties of the human body instead of pressure and generally they
don't work with a stylus so they don't allow handwriting recognition. However,
capacitive touchscreens feel more sensitive than their resistive counterparts.
Capacitive touch
screens are also considered more durable than resistive touch screens.
Car Kit
In some countries, it
is prohibited to use a mobile phone while driving so special accessories are
sold which let you make a call without holding the phone in your hand.
Such accessories are
sold as kits that may include a holder for the phone, a battery charger,
connections to an external speaker and microphone for better audio quality, an
external antenna for better reception and a junction box with data port for
optional fax/modem connections.
Carrier
Carriers (sometimes
service providers, operators) are the companies that sell the use of a wireless
network. Usually they own the network though some (called MVNO) do not.
The network consists
of base stations (cell towers) and the infrastructure linking them.
The service allows
the user to access the network and they are billed by the minute (for calls) or
by kilobytes (for data transfers). Such services are sold as packages known as
"calling plans".
CDMA (Code-Division
Multiple Access)
CDMA is a digital
technology for transmitting data. It is a general technology utilized through
various standards.
CDMA has no limit on
capacity but the base station will only connect users upon determining that the
call quality would fall bellow a predetermined limit.
The term is often
used to refer to one specific family of technologies - IS-95 (often referred to
cdmaOne) and CDMA2000. Networks using this technology operate in the 800 and
1900 MHz frequency bands and are primarily used in the Americas and Asia.
CDMA2000
A 3G wireless technology, evolved from cdmaOne. Improvements over the old
standard include faster data rates, always-on data service, and improved voice
network capacity.
There are three types of CMDA2000:
·
1xRTT doubles the
capacity of cdmaOne and supports up to 144 kbps data speeds
·
1xEV-DO supports
data rates up to 2.4 Mbps but needs to be deployed in a separate spectrum. This
standard doesn't support voice calls and needs to be combined with 1xRTT.
·
1xEV-DV supports
data rates of around 3-5 Mbps and voice capabilities
Cell
Wireless networks are
comprised of many overlapping cells (the area covered by a base station).
"Cell" can
also refer to one or more connected base stations.
Chipset
Mobile phones run on
so-called embedded chipsets, which are designed to perform one or a few
dedicated functions, often with real-time computing constraints. They are
embedded as part of the complete device including hardware and mechanical
parts.
The ever popular
smartphones are equipped with more advanced embedded chipsets that can do many
different tasks depending on their programming.
Thus their CPU
(Central Processing Unit) performance is vital for the daily user experience
and people tend to use the clock rate of the main CPU that's in the heart of
the chipset to compare the performance of competing end products.
As we already pointed
out, the clock rate of a processor is only useful for providing performance
comparisons between computer chips in the same processor family and generation.
Also, as mobile gaming is increasingly gaining popularity, users have
become more aware of the various types of GPU (Graphics Processing Unit) chips
that come as part of the mobile chipsets and sometimes even consider their performance
when making buying decisions.
cHTML (Compact
HyperText Markup Language)
cHTML is a simplified
version of HTML with features such as the accesskey attribute for
numpad-optimized web navigation, phone number shortcuts for links, and emoji
pictorial characters.
cHTML is used
exclusively for iMode, a service that is offered only in Japan and several
European countries.
Most phones use the older WML format or the newer XHTML Mobile Profile.
CIF (Common
Intermediate Format)
A standard resolution
- 352 x 288 pixels - used by some digital cameras for either images or video.
Variations include
QCIF (Quarter CIF) - 176 x 144 pixels - and SQCIF (Sub Quarter CIF) - 128 x 96.
Clamshell
The phone consists of
two halves connected with a hinge in the middle. The hinge allows the phone to
be folded close (much like a sea clamshell, hence the name). When the phone is
closed, the keyboard is protected from accidental key presses.
The top half usually
hosts a small external display and a large internal main display, while the
bottom half incorporates the keyboard.
The camera (if
present) can be on either half.
CMOS (Complementary
metal-oxidesemiconductor)
CMOS is one of two
major types of image sensor technologies used in digital cameras (the other
being CCD). The image sensor of a digital camera serves as a digital substitute
for film in ordinary cameras.
The camera sensor
captures light, converts it to electric charge and processes it into electronic
signals.
Generally, CMOS
sensors are smaller, cheaper and more energy efficient and currently deliver
the same image quality as CCD sensors.
Color depth
This refers to the
number of different colors a display is able to produce. A higher number
results in a broader range of distinct colors. It is commonly accepted that the
human eye can discern up to 10 million colors.
Concatenated SMS
Typically, an SMS is
160 characters in length (using Latin characters) but a concatenated SMS has a
longer maximum length. The message is composed as a single message and the
phone splits it into several shorter messages that are reassembled by the
receiving phone. Maximum length varies between 300 and 1,000 characters
depending on the device.
CPU (Central
Processing Unit)
CPU (Central
Processing Unit) - otherwise known as a processor - is an electronic circuit
that can execute computer programs. Both the miniaturization and
standardization of CPUs have increased their presence far beyond the limited
application of dedicated computing machines. Modern microprocessors appear in
everything from automobiles to mobile phones.
The clock rate is one
of the main characteristics of the CPU when performance is concerned. Clock
rate is the fundamental rate in cycles per second (measured in hertz,
kilohertz, megahertz or gigahertz) for the frequency of the clock in any
synchronous circuit. A single clock cycle (typically shorter than a nanosecond
in modern non-embedded microprocessors) toggles between a logical zero and a
logical one state.
With any particular
CPU, replacing the crystal with another crystal that oscillates with twice the
frequency will generally make the CPU run with twice the performance. It will
also make the CPU produce roughly twice the amount of waste heat.
Engineers are working
hard to push the boundaries of the current architectures and are constantly
searching for new ways to design CPUs that tick a little quicker or use
slightly less energy per clock. This produces new cooler CPUs that can run at
higher clock rates.
Scientists also
continue to search for new designs that allow CPUs to run at the same or at a
lower clock rate as older CPUs, but which get more instructions completed per
clock cycle.
The clock rate of a
processor is only useful for providing comparisons between computer chips in
the same processor family and generation.
Clock rates can be
very misleading since the amount of work different computer chips can do in one
cycle varies. Clock rates should not be used when comparing different computers
or different processor families. Rather, some kind of software benchmarks
should be used.
Smartphones are
equipped with more advanced embedded chipsets that can do many different tasks
depending on their programming.
The performance of
the CPU that's at the core of the chipset is vital for the daily user
experience and the general computing performance of the smartphone. People tend
to use the clock rate of the main CPU to compare the performance of competing
end products. But as we already pointed out, the clock rate of a processor is
only useful for providing performance comparisons between computer chips in the
same processor family and generation. For all other purposes, it's best to use
software benchmarks for determining comparative performance.
Crosstalk
A phenomenon by which
a signal transmitted on one circuit or channel creates an undesired effect on
another circuit. Generally rare in modern digital wireless phone systems but
not entirely eliminated.
Stereo crosstalk for
example is one of the parameters of audio quality we test when reviewing mobile
phones. The crosstalk measurement is made to determine the amount of signal
leaking across from one channel to another or - in purely non-technical terms -
it measures how good the stereo is.
CSTN (Color Super
Twisted Nematic)
STN is a type of LCD
display technology. STN is black and white while CSTN is the color version.
(C)STN displays are used on lower end devices.
Typically an STN
display has worse image quality and response times than a TFT LCD, but is
cheaper and more energy efficient.
CTIA
CTIA is the
International Association for the Wireless Telecommunication Industry, an
international organization dedicated to expanding the wireless frontier.
It's basically an
international industry trade group representing all wireless communication
sectors.
Custom ringtones
Phones come preloaded
with a selection of ringtones, yet some phones also allow the user to load a
new ringtone. This could be done by writing the notes in a built-in composer,
or by downloading the ringtone via a special SMS/MMS or from the internet.
An easy way to
transfer custom ringtones to your mobile phone is via a USB data cable,
Bluetooth or a memory card reader.
When you want to use
custom ringtones, you should check the phone supported file formats beforehand.
D
D-Pad (Direction Pad)
A circular- or
square-shaped pad that provides navigation keys for the four directions: up,
down, left and right. These are the equivalent of the "arrow keys" on
a computer keyboard and are used for navigating the user interface.
An enhanced version
of the D-pad called an 8-way D-pad allows for scrolling diagonally as well.
Some D-Pads have a
center button usually called "select" or "OK". It is used
to select a highlighted item in the user interface.
Digital Zoom
Zoom is a feature common among cameras and is used to make the subject
appear closer. Cameras on mobile phones often have a zoom feature as well but
most often it is digital zoom.
Digital zoom is implemented in one of two ways:
·
Cropping - the
software crops the image so that the subject would appear bigger on the screen
of the phone but the resulting image is smaller than the maximum resolution of the
camera. The photo of the subject does not have any more detail than a
non-cropped photo would.
·
Stretching - this
is similar to cropping but instead it stretches the cropped photo to the
selected resolution. Since the stretching is done by an algorithm that uses
just the information from the cropped photo no additional detail is visible.
Display type
There are lot of
display types used in mobile phones. They can be either color or monochrome.
Monochrome displays on the other hand can be alphanumeric or graphic.
Alphanumeric displays can show only symbols with a constant size, while graphic
displays can show fonts of different sizes and animations.
The color displays
usually are CSTN, TFT, TFD or OLED with a predominant use of TFT displays in
current mobile lineups. There are also two types of touchscreen displays -
capacitive and resistive, which are both based on TFT technology.
CAPACITIVE
touchscreens work by sensing the electrical properties of the human body, while
RESISTIVE ones operate by sensing direct pressure applied by the user.
The RESISTIVE type
can be activated by pressing not only with human skin but also with a stylus
and thus allow handwriting recognition input.
DLNA (Digital Living
Network Alliance)
DLNA refers to both
an organization and the technology they created.
The DLNA standard is
used for sharing music, photos and video over an existing home network.
For example, by using
DLNA you could stream video from your phone to a compatible TV-set using a
Wi-Fi network.
DNSe (Digital Natural
Sound engine)
DNSe or the Digital
Natural Sound engine is a DSP audio enhancement technology developed by Samsung
in 2003 and further on implemented throughout many of their product lineups -
from TVs and DVD players to portable music players and lately - mobile phones.
As Samsung puts it,
the aim of DNSe is to restore the best sonic experience to the end user.
Purportedly, the sound engine yields higher quality sound with more natural
effects than conventional methods by reproducing the 'genuine' stereo sound
intended by the music content creators. It achieves this by actively working on
overcoming the limitations of earphones and less-than-ideal speakers to offer
realistic stereo and deep bass sounds.
In addition, Samsung
have created ideal listening presets that further compensate for the native
restrictions of portable multimedia players. The system uses several basic
processing methods aiming at various imperfections of the sound produced by
portable players.
Concert
Hall recreates
life-like reflected and reverberated sounds to simulate the experience of a
live performance in a concert hall. 3D
speaker separates and
combines sound to create realistic sense of both space and distance through
small-sized speakers. Clarity enhancement tries to electronically
restore the distorted harmonics of the digitally compressed music. Bass Extension applies an electronic harmony logic to
correctly play hi-fidelity sounds at an ultra-low frequency through earphones
or small-sized speakers. And finally, Street
mode selectively adjusts
volume so that the tiny notes are audible even in the loud street environment
without the uncomfortable boosting of the general volume level.
The DNSe sound
enhancement system combines those sound enhancements with different equalizer
settings to create various user-centric presets to suit the most common
listening scenarios. If that is not enough, the system alows creating custom
presets as well.
Samsung DNSe is not
to be confused with the Samsung proprietary DNIe (Digital Natural Image engine)
technology. DNIe is used in Samsung plasma and high definition television sets
(HDTV). Purportedly, DNIe offers better detail than conventional televisions by
using four proprietary processes that optimize and enhance image quality: a Motion
Optimizer, a Contrast Enhancer, a Detail Enhancer, and a Color Optimizer.
Downlink
The one-way
connection from a server (such as the cellular network) to the user device
(such as a mobile phone).
Mobile phones
typically utilize a two-way connection consisting of downlink and uplink (the
connection from the user device to the server) which is asymmetrical - that is,
the downlink is much faster than the uplink.
DRM (Digital Rights
Management)
Manages the use of
copyright-protected data such as music, graphics, videos etc.
For example, DRM can
prohibit you sending a downloaded media file to other media such as CD, DVD, or
even PC.
Dual-band
Mobile phone networks
work using signals on specific frequency bands and a phone must support those
bands in order to work with the network. Dual-band refers to the phones ability
to work with two different bands. It is important to specify which bands
exactly.
Networks in different
geographical locations work on different bands - GSM networks in the Americas
use the 850 MHz and 1900 MHz bands while networks in Europe, Brazil, Asia and
Africa use the 900/1800 MHz bands.
For example an
900/1800 dual-band phone won't work in the US and an 850/1900 phone won't work
in Europe. A 900/1900 phone should work on at least one network in most
countries around the world.
Dual-Mode
A dual-mode phone is
a phone capable of sending/receiving data in two different ways. For example, a
dual-mode phone could support both GSM and CDMA.
Dual-SIM
This specifies
whether a device is capable of supporting two SIM cards. The two major types of
dual-SIM phones are active and standby. Dual-SIM Standby (DSS) requires the
user to specify which of the two SIMs is able to make and receive calls, while
Dual-SIM Active (DSA) enables both cards to receive calls at the same time.
This latter feature usually requires an additional transceiver for the
secondary SIM card, and as such consumes more battery life. More recent models
feature Dual SIM Dual Standby (DSDS) technology which enables them to have two
active SIMs with only one transceiver.
DVB-H (Digital Video
Broadcasting - Handheld)
A European standard
specifically for the broadcasting of television content to hand-held devices
based on DVB-T.
As of 2007, live
trial runs of DVB-H have started in many European countries, as well as other
countries around the world.
Dynamic Memory
A way or organizing
different types of data in the phone's memory. Also referred to as Shared
memory.
Dynamic memory means
that all types of data are stored in the same memory (there is no separate
memory for photos, ringtones etc.).
An advantage of
dynamic memory over partitioned memory is that it is more flexible - with
partitioned memory, you can fill up the photo memory for example and you won't
be able to take any more photos even if other types of memory are free.
E
EDGE (Enhanced Data
for Global Evolution)
EDGE (also known as
Enhanced GPRS or EGPRS) is a data system used on top of GSM networks. It
provides nearly three times faster speeds than the outdated GPRS system. The
theoretical maximum speed is 473 kbps for 8 timeslots but it is typically
limited to 135 kbps in order to conserve spectrum resources. Both phone and
network must support EDGE, otherwise the phone will revert automatically to
GPRS.
EDGE meets the
requirements for a 3G network but is usually classified as 2.75G.
EDR (Enhanced Data
Rate)
An optional part of
the Bluetooth specification that provides a faster data rate (speed) and
possibly improved battery life. Not all Bluetooth devices support EDR and will
depend on the Bluetooth version and supported profiles. Both devices need to
support EDR, in which case EDR is used automatically.
EGPRS
A synonym for EDGE.
EGSM (Extended GSM)
EGSM extends the
frequency bands of GSM 900 giving it added network capacity.
Most new phones
listed as GSM 900 also support EGSM.
Email client
Some phones provide a
full email client that can connect to a public or private email server via a
wireless data connection(cellular or Wi-Fi).
There are different
protocols used by the servers and some may not be supported by the phone's
email client.
EMS (Enhanced Message
Service)
EMS or the Enhanced
Messaging Service is an extension of SMS, which allowed mobile phone to send
and receive messages that have special text formatting (such as bold or
italic), animations, graphics, sound effects and ringtones.
EMS is an
intermediate technology between SMS and the rich multimedia messages otherwise
known as MMS.
EV-DO
A 3G technology
add-on for CDMA networks that allows for theoretical download speeds as fast as
2.4 Mbps, though actual rates tend to be far slower.
There are two major
versions: Release 0 and Revision A.
Release 0, the
original release, is widely deployed. It offers data rates of 2.4 Mbps, with
real-life speeds averaging 300-600 Kbps.
Revision A introduces
enhancements that allow features such as VoIP and video calling. Although EV-DO
does not support voice calls natively a future upgrade may enable VoIP.
EV-DV
EV-DV is part of the
same family of CDMA connectivity as EV-DO. Unlike EV-DO, however, EV-DV also
supports voice calls. EV-DV is essentially a combination of EV-DO and 1xRTT.
Development of the
technology stalled before launch and was superseded by EV-DO plus VoIP.
Exchangeable covers
Some phones have been
designed to let the user remove the covers (front and back) and replace them
with others, changing the color, pattern or even the styling of the phone.
Some examples include
Nokia Xpress-On covers and Sony Ericsson Style-Up covers.
External Antenna Jack
A connector that
allows an external antenna to be connected to the phone to improve reception
indoors or in a car. The jack is usually hidden in some way, most commonly with
a rubber plug.
Note: not all antenna
jacks are the same
External Display
Since the display of
clamshells is hidden when the phone is closed, many phones include a secondary
display on the outside.
This display is of
lower quality than the main display (lower resolution, may be monochrome,
etc.). It is used to display various notifications such as the time, Caller-ID,
missed calls.
In many camera
phones, the external display can act as a viewfinder to help frame
self-portrait photos.
F
FCC (Federal
Communications Commission)
Known also as the
FCC, the Federal Communications Commission is a US government agency controlled
by Congress. The FCC monitors and regulates interstate and international
communications by radio, television, satellite and cable.
The FCC also
certifies all mobile phones intended for use in the US, insuring compliance
with spectrum allocations, technical standards, and safe radiation levels.
Feature Phone
A mobile phone that
is not smartphone. It has operating system firmware, but third party software
support is limited to only Java or BREW applications.
Recently feature
phones have begun to offer similar features to those of smartphones, so the
main difference between the two groups now is the third-party software support.
Femtocell
A small cellular base
station, typically designed for use in residential or small business
environments. The benefits of these portable base stations are similar to the
ones of using, for example, regular Wi-Fi access points. They allow the
expansion of the corporate telephony and intranet network so it can be used by
regular mobile phones.
Femtocells are the
size of a regular broadband cable router. The small size offers a small area of
coverage – in most cases a large-spaced room or two or three separate small
rooms.
The femtocell can be
easily installed by end users, while cellular towers are only installed by the
carrier.
Firmware
Fixed software
programs that internally control various electronic devices or individual
hardware parts of these devices (such as mobile phones). They involved very
basic low-level operations of the device, without which the device would be
completely non-functional.
More simple firmwares
are usually stored on ROM or OTP/PROM, while more complex firmwares occupy
flash memory to allow for updates. Common reasons for updating firmware include
fixing bugs or adding features to the device.
Doing so usually
involves loading a binary image file provided by the manufacturer into the
device, according to a specific procedure. More often than not this is meant to
be done by the end user.
Fixed-focus
The camera focus is
set to a specific distance by the manufacturer and can’t be adjusted.
Fixed focus digital
cameras limit the photo quality and the minimum shooting distance (no close-ups
are possible). The fixed focus technology uses a very small lens with a tiny
aperture, thus making all visible subjects in focus no matter their distance
from the camera.
Basic mobile phones
cameras are usually of the fixed-focus type.
Flash Memory
Flash memory is
non-volatile computer memory that can be electrically erased and reprogrammed.
Non-volatile means that no power is needed to maintain the information stored
on the chip.
It is a technology
that is primarily used in memory cards and USB flash drives as solid state
storage and its main purpose is an inexpensive way of storing or transferring
data between computers and other digital products. It’s used as primary storage
memory on various portable devices due to its low cost, compact size, great
physical endurance and low power consumption.
The most popular
types of flash memory are NAND and NOR.
Flight mode
Known also as
Airplane mode, this mode disables all radio parts of a mobile phone but leaves
other functions available. These include music player, organizer and everything
that doesn't require the radio transmitters.
This mode is required
because most airlines forbid the use of wireless devices during flight. Some
airlines do not allow the use of such devices even in Airplane mode.
There is an industry
standard icon to signify that airplane mode is on but not all phones use it.
This mode is required
for several reasons. Preventing interference with the airplane equipment is the
best known one but another reason is that cell towers cannot handle phones
moving at high altitudes and speeds.
Flip-down phone
It’s a mobile phone
form factor that’s a cross-over between the Bar and Clamshell form factors.
In this case the
device is mainly a bar, but a thin "flip" part covers the keypad
and/or display when not in use.
FM Radio
The built-in FM radio tuner is now considered a basic feature. It allows
the user to listen to most of the live-broadcasted FM radio stations. Almost
all phones with FM radio tuner require a wired headset to be connected to the
unit as it’s used as an antenna.
Most FM radio tuners can receive basic radio station info over RDS. The use
of FM radio does not interfere with the network carrier and it’s free.
Nokia enhance their FM radio interfaces with the Visual Radio enhancement
that adds visuals and text as an additional info layer to normal radio
broadcasts.
A presentation of graphics and text, synchronized to the audio programming,
gets downloaded to the phone over a data connection; the FM transmission chain
is unaffected by the addition of Visual Radio.
Here's the type of content that Visual Radio can offer:
·
Information on the
song and artist currently playing on air
·
View images related
to presenters or news stories
·
A weather map
during the weather broadcast
·
News, weather and
traffic alerts while songs are playing
·
Listen in to a
talk show and see what has been discussed so far
·
Join in audience
votes, Big Brother style
·
Participate in on-air competitions
You can only use the Visual Radio enhancement via a cellular data
connection, as using it over Wi-Fi is not an option.
FM Transmitter
An FM transmitter
allows a phone to broadcast music stored in its memory on FM frequencies, so
that it can be tuned into a nearby FM receiver such as a a car radio.
FM transmitters are
not a common feature on mobile phones, but such modern models do exist. The
mobiles transmit at low power so interference with regular FM radio stations is
highly likely – especially in dense urban environments where most of the FM
spectrum is already populated by live radio broadcasts.
Some embedded FM
transmitters allow for transmitting the music details over RDS.
Form factor
The general look, or
size and shape, of a mobile device.
All mobile phones are
similar at the physical style level. Most devices fall into one of the
following categories: Bar, Clamshell, Flip down, Slide or Swivel. Mobile
manufacturers come up with new designs, but the base they use is normally one
of these form factors.
FOTA (Firmware
Over-The-Air)
This is a special
feature supported by some phones, where users can update their handset firmware
over the carrier network. It removes the need of special cables, computers or
third-party programs.
FPS (Frames Per
Second)
This measurement is
the video resolution measured in time. 24-30 fps is the normal level for good
picture quality. A video with lower framerates appear as “choppy” on screen and
fail to capture fast moving objects properly.
Frame Error Rate
Ratio of data
received with errors to total data received. Used to determine the quality of a
signal connection. If the FER is too high (too many errors), the connection may
be dropped.
Frequency
Measured in hertz
(cycles per second), rate of repetition of changes / waves.
The term frequency is also used for range
(band) on the radio frequency spectrum, such as 800 MHz, 900 MHz or 1900 MHz.
FTP (File Transfer
Protocol)
A standard for
transferring files over the Internet. Not commonly used on phones, although
there is FTP software available for most smartphone platforms.
G
GB (Gigabyte)
1GB is equal to
approximately 1 billion bytes or exactly 1024 MB.
Gbps (Gigabits per
second)
1 Gbps = 1024 Mbps.
Gbps measures data transmission over a carrier.
Geo-tag
Geo-tagging is a
function, where GPS-enabled devices can insert metadata with geographical
information (coordinates) into a file such as photo, associating it with the
geographic location it was taken at.
Some new cameraphones
support automatic geo-tagging of any pictures taken.
Geo-tags can be read
by any device or desktop computer software which reads geo-tagging metadata,
such as image editors and online image galleries.
GPRS
General Packet Radio
Service is a packet-switching technology that enables data transfers through
cellular networks. It is used for mobile internet, MMS and other data
communications. In theory the speed limit of GPRS is 115 kbps, but in most
networks it is around 35 kbps. Informally, GPRS is also called 2.5G.
GPS (Global
Positioning System)
Global Positioning
System was developed by the United States' Department of Defense. It uses
between 24 and 32 Medium Earth Orbit satellites that transmit precise microwave
signals. This enables GPS receivers to determine their current location, time
and velocity. The GPS satellites are maintained by the United States Air Force.
GPS is often used by
civilians as a navigation system. On the ground, any GPS receiver contains a
computer that "triangulates" its own position by getting bearings
from at least three satellites. The result is provided in the form of a
geographic position - longitude and latitude - to, for most receivers, within
an accuracy of 10 to 100 meters. Software applications can then use those
coordinates to provide driving or walking instructions.
Getting a lock on by
the GPS receivers on the ground usually takes some time especially where the
receiver is in a moving vehicle or in dense urban areas. The initial time
needed for a GPS lock is usually dependent on how the GPS receiver starts.
There are three types of start - hot, warm and cold.
The hot start is when the GPS device remembers its
last calculated position and the satellites in view, the almanac used
(information about all the satellites in the constellation), the UTC Time and
makes an attempt to lock onto the same satellites and calculate a new position
based upon the previous information. This is the quickest GPS lock but it only
works if you are generally in the same location as you were when the GPS was
last turned off.
The warm start is when the GPS device remembers its
last calculated position, almanac used, and UTC Time, but not which satellites
were in view. It then performs a reset and attempts to obtain the satellite
signals and calculates a new position.
The receiver has a
general idea of which satellites to look for because it knows its last position
and the almanac data helps identify which satellites are visible in the sky.
This takes longer than a hot start but not as long as a cold start.
And finally – the cold start is when the GPS device dumps all the
information, attempts to locate satellites and then calculates a GPS lock. This
takes the longest because there is no known information.
The GPS receiver has
to attempt to lock onto a satellite signal from any available satellites,
basically like polling, which takes a lot longer than knowing which satellites
to look for. This GPS lock takes the longest.
In an attempt to
improve lock times, cellphone manufacturers and operators have introduced the
Assisted GPS technology, which downloads the current ephemeris for a few days
ahead via the wireless networks and helps triangulate the general user’s
position with the cell towers thus allowing the GPS receiver to get a faster
lock at the expense of several (kilo)bytes.
gpsONE
gpsOne is the brand
name for a mobile GPS chipset manufactured by Qualcomm that allows mobile
phones to lock a user’s position faster by using a technology referred to as
A-GPS or Assisted-GPS.
gpsOneXTRA Assistance
technology
Qualcomm's new
gpsOneXTRA Assistance technology provides enhanced operation by enabling a user
to download a small assistance data file through a brief Internet access
session.
Network operators who
have not yet deployed A-GPS systems can provide their subscribers with enhanced
GPS performance on mobile handsets by using Qualcomm's gpsOneXTRA Assistance
technology.
GPU (Graphics
Processing Unit)
The GPU (Graphics
Processing Unit) is a specialized circuit designed to accelerate the image
output in a frame buffer intended for output to a display.
GPUs are very
efficient at manipulating computer graphics and are generally more effective
than general-purpose CPUs for algorithms where processing of large blocks of
data is done in parallel.
Modern smartphones
are equipped with advanced embedded chipsets that can do many different tasks
depending on their programming. GPUs are an essential part of those chipsets
and as mobile games are pushing the boundaries of their capabilities, the GPU
performance is becoming increasingly important.
H
H.263
A video codec
standard originally designed as a low-bitrate compressed format for
videoconferencing. It has been widely adopted as the standard for video
streaming over mobile networks.
Standard image sizes
specified by H.263 include SQCIF (128 x 96 pixels), QCIF (176 x 144), and CIF
(352 x 288) resolutions.
H.263 handles only
the visual part of a video stream, the audio is encoded using audio encoders
such as AMR.
Half-QWERTY keyboard
layout
A keyboard layout
similar to QWERTY but having two letters per key. The basic arrangement is the
same, however the keyboard is narrower which makes it suitable for use with one
hand and it fits more easily in the lower part of a bar-shaped device.
Predictive text is
almost always used auto-suggest words allowing users to press a button only
once.
Handwriting
recognition
The ability of a
device or software program to analyze the shape of cursive or printed
handwriting drawn on a touchscreen and then translate it into letters, words,
numbers, and punctuation marks.
Most devices that
have touchscreens have built-in handwriting recognition capability. Input is
best done using a stylus.
It should be noted
that only devices using resistive type of touchscreen readily allows for input
with various objects. The capacitive touchscreen devices can accept only human
finger input.
Haptics
A category of
technology that provides physical feedback when the user interacts with virtual
things. This could be "pressing" a button on a touch screen or
"feeling" the rough edge of the road in a racing game.
The feedback is
implemented as vibration.
Hot Spot
An area where users
can access Wi-Fi services to access the Internet if they have the appropriate
device. Hot spots vary in area of coverage. They are usually public and many
charge users by the day or month. However, some are free - for example
privately owned in restaurants or cafes or public in universities and schools.
Hot Swap
Inserting or removing
an external peripheral device (such as flash memory or hard drive) from a host
(a mobile phone or desktop computer) while the host is still operating.
"Hot
swappable" refers to a component's ability to be operated in such way.
In mobile phones,
this usually refers to the ability to insert or remove the memory card without
switching off the device.
HSCSD (High-Speed
Circuit Switched Data)
A system for data
calls on GSM networks that came before packet based systems such as GPRS and
EDGE.
HSCSD is the
"high-speed" variant of CSD (maximum speed of 9.6 kbps) that has
better error-correction codes that give a boost in speed of about 50% and
allows several call channels to be used as one - up to four channels -
resulting in a maximum speed of 57.6 kbps.
HSCSD was never
widely adopted outside Europe.
HSDPA (High-Speed
Downlink Packet Access)
An upgrade for UMTS
networks that doubles network capacity and increases download data speeds by
five times or more.
The service was
initially deployed at 1.8 Mbps but upgrades to the networks and new user
devices led to increased rates of 3.6 Mbps, followed by 7.2 Mbps.
HSDPA only handles
the downlink while the uplink is handled by a related technology called HSUPA.
The combination of both technologies is usually called HSPA.
HSP (Headset Profile)
A Bluetooth profile
that enables wireless connection between a phone and a Bluetooth headset. It
supports simultaneous two-way audio but not stereo.
It is one of the most
common profiles with only a small number of phones supporting only the similar
Handsfree profile.
HSP is used by other
devices as well, a Bluetooth-enabled PC with VoIP software such as Skype for
example.
HSUPA (High-Speed
Uplink Packet Access)
An upgrade for
UMTS/HSDPA networks that increases upload data speeds up to 5.76 Mbps. HSUPA together
with HSDPA are sometimes referred to as HSPA.
The standard is
backwards compatible with UMTS and HSDPA and will work with devices supporting
only those standards.
HSUPA only handles
the uplink while the downlink is handled by a related technology called HSDPA.
HTML (Hypertext
Markup Language)
A standard markup
language used to create web pages.
It was designed with
desktop computers in mind and web pages may have reduced usability when viewed
on devices with smaller screens and limited input options (as is the case with
most mobile phones).
There is a newer
format called XHTML that is better suited for mobile devices.
Hz (Hertz)
A unit of frequency
measurement equal to one cycle per second.
I
iDEN (Integrated
Digital Enhanced Network)
A TDMA based digital
mobile network system. It was developed by Motorola, which remains the main
manufacturer for iDEN devices. The main advantage of iDEN is the Push-To-Talk
system, which enables mobile phones to be used as walkie-talkies.
Newer iDEN phones use
a SIM card that is compatible with GSM phones for international roaming, but
only a few phones support both standards.
IMAP (Internet
Message Access Protocol)
An Internet protocol
used by email clients to access messages from a server. IMAP is a newer
alternative to POP3.
Unlike POP3, which
only downloads the messages, IMAP synchronizes them with the email server and
tracks changes in their status. Another feature of IMAP is that it allows
messages to be organized by folders and the email client setup to use IMAP
access will also synchronize the folders beside the emails themselves.
IMEI (International
Mobile Equipment Identity)
IMEI is a unique
15-digit serial number that uniquely identifies a GSM or UMTS mobile phone. It
consists of four parts and provides information, such as the manufacturer, to
the mobile network. It is usually printed on the device under the battery.
IMEI can be used to
"ban" a stolen phone, making it hard to use by the thief with a new
SIM card.
IP (Internet
Protocol)
IP is the the protocol
used for communicating data across a packet-switched network used in most
publicly accessible networks today. Connections that mobile devices make to
GPRS, 3G and similar networks are made using IP.
IrDA (Infrared Data Association)
·
A
standard for transmitting data using an infrared port. Transfer speeds are
roughly the same as traditional parallel ports.
·
The
industry group that created the IrDA technical standard.
Infrared connectivity
is an old wireless technology used to connect two electronic devices. It uses a
beam of infrared light to transmit information and so requires direct line of
sight and operates only at close range.
IR was superseded by
Bluetooth, which has the advantage of operating at longer distances (around 30
feet) and being omni-directional.
Many home devices
such as TVs and DVD players still use IR remote controls. Some smartphones are
capable of using their IR port to control these devises but that usually
requires third-party software.
J
Java
Often stands for
"Java ME" (the new name of J2ME, Java 2 Platform, Micro Edition).
Java ME is a platform for applications running on mobile phones. These, mainly
small, applications (e.g. games) can be downloaded from the Internet directly
to the phone using its built-in web-browser.
K
KB (Kilobyte)
A unit of digital
information equal to 1024 bytes. Also abbreviated as kB, K and Kbyte.
Kbps (Kilobits per
second)
A unit of data
transfer rate equal to 1024 bits per second.
Key Guard
A feature allowing
you to lock the keyboard to avoid any accidental dialing of a number or
pressing of keys while carrying the phone in a pocket or bag. The keyboard is
unlocked by a special sequence of keys unlikely to be pressed accidentally.
Key Lock Switch
A dedicated
switch/key/button that locks (and unlocks) a device's keypad.
L
Land line
Non-wireless
telephone connection.
LCD (Liquid Crystal
Display)
A liquid crystal
display is the most common display type among mobile phones because of its low
power consumption and good image quality. They are generally easy to read, even
under direct sunlight.
The smallest element
of an image displayed on a LCD is the pixel. Each pixel normally consists of a
layer of molecules aligned between two transparent electrodes, and two
polarizing filters.
Some of the types of
LCD displays are STN, TFT and TFD. The first one, STN, offers low cost and low
power consumption, but low image quality. TFT features greater image quality
and response time, yet its displays are more expensive and need more power.
Three other types of
LCDs are transmissive, reflective, or transflective. Transmissive displays
offer nicer image quality in low or medium ambient light, while reflective ones
work best in bright ambient light. Transflective displays combine the best of
both.
LED (Light-Emitting
Diode)
A semiconductor diode
that emits light when charged with electricity. They come in diverse colors and
some LEDs even contain multiple elements and are therefore capable of emitting
light with different colors.
LEDs are used for
displays, for keypad or display backlighting, etc. Bright white LEDs also can
be used as flashlights and flashes for mobile phones. Even if they are not as
bright as the xenon flash, LEDs are much more compact and require less energy -
and also can be used as video light.
Li-Ion (Lithium Ion)
This stands for a
type of rechargeable battery. They are much lighter than earlier battery types
(NiCd and NiMH), have a long life cycle and generally don't suffer from the
so-called "memory effect".
Li-Polymer (Lithium Polymer)
This stands for a
type of rechargeable battery which has evolved technologically from Lithium-Ion
batteries.
Current
lithium-polymer batteries are actually Lithium-Ion Polymer and perform
similarly to Lithium-Ion batteries. The advantage however of Li-Polymer
batteries is that they can be made much thinner.
Generally, they don't
suffer from the so-called "memory effect" common to NiCd and NiMH
batteries.
Linux
A family of
open-source operating systems. There are a lot of variants of Linux available
and they are developed and maintained by diverse working groups. There are also
some Linux-based OSes for mobile devices (e.g. Android or Maemo).
Location-Based
Services (LBS)
A term that refers to
a wide range of services based (or enhanced by) information about the physical
location of a user and/or device.
Typical examples of
location-based services for consumers are real-time turn-by-turn navigation,
the location of the nearest restaurant or hotel, vehicle tracking etc.
For a location-based
service to work there are some requirements to be fulfilled. The network must
support it, and certain technologies must be built into the mobile phone (such
as GPS and A-GPS).
Lock code
A code preventing the
unauthorized use of a mobile phone. the user isn't given access to the phone
without entering the right sequence of numbers using the keypad. Only emergency
or other predefined numbers may be dialed while the mobile phone is locked.
Long SMS
Also known as
"Concatenated SMS".
Long term evolution
(LTE)
LTE is the next-step
of the evolution of UMTS (3G) and HSDPA (3.5G). It's what is technically
correct called 4G. Some carries market especially high speed 3.5G HSDPA as 4G
network, but that's not correct.
Some of the
improvements LTE brings along over the currently used wireless mobile radio
technologies are a better spectral efficiency, lower costs, higher transfer
speeds, improved services, etc.
LTE networks are
widely commercially available in the USA. In Europe the network standard is not
as widely spread and there are individual networks available only in some
cities.
Theoretically, LTE
networks should provide wireless data download speeds of up to 300Mbps and
wireless download speeds of up to 75Mbps.
Loudspeaker
The loudspeaker is a
small sound driver fitted within a mobile phone, or other communication device,
which is used to produce sound. Traditionally, loudspeakers on mobile phones
are used to produce sound alerts for events such as incoming calls, incoming
messages and alarms.
Since mobile phones
have started doubling as portable music players in recent years, users have
begun using their built-in speakers for playback of music. Acknowledging this
new type of use of the mobile phone loudspeaker, manufacturers have begin to
equip their music or video-centric mobiles with more powerful loudspeakers or
even a pair of loudspeakers for accurate stereo reproduction and enhanced
spatial effects.
Loudspeakers are also
used to reproduce voice calls out loud, thus allowing users to deal with calls
hands-free or even have conference calls with others in the same room (that use
of the mobile phone is called a speakerphone, which is not to be confused with
a loudspeaker).
Loudspeaker
implementation can vary from model to model. For example, in order to save
space and make phones thinner, some manufacturers don't use a dedicated
loudspeaker but instead use the earpiece speaker to produce sound alerts as
well.
M
Macro
Most often this term
is use to describe the macro mode of a camera. This mode allows the taking of
photos from extremely short distance unlike close-ups, which also need an auto
focus lens but are shot from a slightly greater distance.
mAh
An ampere-hour or
amp-hour (Ah) is a unit of electric charge. Smaller batteries however, such as
those in mobile phones and digital cameras, are often rated in
milliampere-hours.
The milliampere-hour
(mAh) is one-thousandth of an ampere-hour and is a technical term for how much
electrical charge a particular battery will hold. As an example, using higher
mAh batteries in a device with constant electrical consumption will
theoretically give you longer operating times.
Mass Storage mode
A standard mode
allowing compatible phones to be connected to a computer's USB port and be used
as a removable storage drive without the need for any special drivers.
Usually, in Mass
Storage mode, the phone's memory is mounted as a removable drive by the
computer OS and cannot be used by the phone itself. That's the reason why some
phones only allow an inserted memory card to be mounted in Mass Storage mode
thus keeping their system partition inaccessible on the computer in this mode.
MB (Megabyte)
A unit of digital
information equal to 1,048,576 bytes or 1024 kilobytes.
Mbps (Megabit per
second)
A unit of data
transfer rate equal to 1,048,576 bits per second or 1,024 kilobits per second.
Megapixel
One million pixels.
Pixel comes from "pix" (for "picture") and el (for
"element"). A pixel is the smallest piece of information on an image.
This is a unit for measuring image resolution, and the more pixels a picture
consists of, the more detailed it is.
Memory card slot
A special slot for
inserting a memory card. Memory cards allow you to expand the phone's built-in
memory (or in the past these slots have been used to add some missing features
such as Wi-Fi connectivity).
Memory cards have
different capacities and are used to store and transfer files between
compatible devices. There are several types of memory cards. The most popular
and frequently used by mobile phone manufacturers is microSD; however, up until
recently Sony Ericsson exclusively used the Memory Stick Micro (M2) card type
developed by Sony.
Memory card slots can
have various supported memory card capacities. Depending on the device, card
slots can support capacities of up to 2, 4, 8, 16 or 32GB and more.
As manufacturers
rarely test their products for compatibility with newer and larger cards that
come out after a specific handset is out on the market, whenever it is
possible, we try to verify that larger capacity cards run on older phones.
When we confirm that
a mobile phone works with a larger capacity memory card than what the
manufacturer has advertized, we usually put that down in the phone specs sheet
in our database.
That way, when you
see the word "verified" in the Card slot field, you will know our
reviewing team has personally tested the device for compatibility with the
stated capacity and they are compatible even though it may not be officially
stated so by the manufacturer.
Still, you should take
that information with a pinch of salt, as your mileage with your specific unit
may vary.
Memory effect
Describes the gradual
shortening of a battery's life if the battery is recharged before it is
completely discharged. It is most common with nickel-based batteries such as
NiCd and NiMH types.
Messaging
In addition to pure
voice calls, all GSM carriers also offer messaging services and messaging has
been a core service since the beginning of GSM mobile telephony. Mobile
messaging ranges from SMS, through EMS, to IM and Email.
MHz (Megahertz)
Herz is a measure of
frequency per unit of time, or the number of cycles per second. The most common
uses for hertz are to describe radio and audio frequencies. It`s abbreviated as
Hz. 1 Megahertz, or 1 MHz, is equal to 1 million Hz.
Micro USB
A type of USB
connector. USB stands for "Universal Serial Bus". Devices connected
to the computer using a USB cable can easily exchange files and information (if
the device supports Mass Storage mode, the files can be transferred without the
need for special drivers or software).
Some devices can be
charged via the USB cable when connected to the computer. There are different
USB interfaces: MicroUSB (with two subtypes - Micro-A and Micro-B) is one of
them, and was developed to replace the older MiniUSB interface. However, the
latter is still the most popular connector type in portable devices.
microSD
A memory card is a
flash memory data storage device used in a wide range of digital devices such
as mobile phones, digital cameras, PDAs, music players, etc. They are small,
rugged and offer high re-record ability.
There is a wide range
of memory card formats. MicroSD (SD stands for "Secure Digital") and
M2 (memory Stick Micro) are the smallest at the current time. The microSD
format was originally called TransFlash or T-Flash.
microSDHC
The microSDHC cards
(HC as in High Capacity) upgrade the microSD standard. They have the same
physical dimensions but offer higher capacities (4-64+ GB) than the regular
ones (64MB-2 GB).
Microsoft Exchange
(Server)
A messaging and
collaborative software product developed by Microsoft as a PC-based e-mail
server. Targeted at the corporate world, Exchange's major features consist of
electronic mail, shared calendars and tasks, and support for mobile and
Web-based access to email accounts and information, as well as support for very
large amounts of data storage.
MIDI (Musical
Instrument Digital Interface)
A set of
specifications allowing computers, synthesizers, MIDI controllers, sound cards,
samplers and drum machines to control one another and exchange system data.
MIDI files keep
information that describes the instruments, notes and timing of the music. This
can then be recreated on MIDI-capable devices as music.
More sophisticated
MIDI devices can not only reproduce consecutive notes (monophony) but are able
to create realistic-sounding music by synthesizing several notes simultaneously
- polyphony. The more notes the synthesizer can play simultaneously, the nicer
it sounds.
MIDI files were
commonly used as mobile phone ringtones before the support for the MP3/AAC
standard was widely adopted.
MIDP (Mobile
Information Device Profile)
A standardized
runtime environment allowing the use of Java on embedded devices (e.g. mobile
phones). It is based on J2ME. Newer versions of MIDP (e.g. MIDP 2.0) increase
functionality by adding additional APIs.
Mil-Spec (MIL-STD)
Comes from
"Military Specification/Standard". With regards to mobile phones, it
normally refers to the US Army's set of standards, called MIL-STD 810.
These standards
specify the requirements that a rugged device must fulfill, such as surviving
certain environmental conditions.
There are lots of
sub-categories of the MIL-STD 810 referring to different extreme conditions. As
only a few devices support all sub-categories, it is important to note exactly
which of them is supported by a certain device. A capital letter added to the
name indicates which specifications are met - MIL-STD 810F for example means
resistance to rain, shock, vibration, dust, humidity, salt fog and extreme
temperatures.
Mini-USB
A type of USB
connector. USB stands for "Universal Serial Bus". Devices connected
to the computer using a USB cable can flawlessly transfer files and information
between the phone and the computer (if Mass Storage mode is supported files can
be transferred without the need of special drivers or software).
Some devices can be
charged when the USB cable is connected to the computer. There are different
USB interfaces: Mini-USB (with two subtypes - Mini-A and Mini-B) is one of
them,but it's in the process of being replaced by the newer and slimmer
Micro-USB interface.
The miniUSB connector
however is still the most popular connector type in portable devices.
miniSD
A memory card is a
flash memory data storage device used in a wide range of digital devices such
as mobile phones, digital cameras, PDAs, music players, etc. They are small,
rugged and offer high re-record ability and power-free operation.
There is a wide range
of memory card formats, miniSD (SD stand for Secure Digital) being one of them.
It's now considered an outdated standard and in the current generation of
portable devices has been replaced by the microSD and microSDHC formats.
MMC
A memory card is a
flash memory data storage device used in a wide range of digital devices such
as mobile phones, digital cameras, PDAs, music players, etc. They are small,
rugged and offer high re-record ability and power-free operation.
There is a wide range
of memory card formats. MMC (which stands for "Multi Media Card") is
one of the oldest formats and has been replaced by newer ones like SD, microSD
and microSDHC. Physically, it's fully compatible with SD cards.
MMCmobile
A memory card is a
flash memory data storage device used in a wide range of digital devices such
as mobile phones, digital cameras, PDAs, music players, etc. They are small,
rugged and offer high re-record ability and power-free operation.
There is a wide range
of memory card formats. MMC (which stands for "Multi Media Card") is
one of the oldest formats and has been replaced by newer ones like SD, microSD
and microSDHC.
MMCmobile cards are
based on the RS-MMC cards and share the same mini form factor. The difference
between them is that MMCmobile cards are dual-voltage and can operate in older
phones with a high-voltage (3V) slot as well as in newer models with a
low-voltage (1.8V) slot.
The MMCmobile
standard is now considered an outdated standard and has been replaced by newer
ones like microSD and microSDHC.
MMS (Multimedia
Messaging Service)
Abbreviated as MMS,
the Multimedia Messaging Service is a store and forward messaging service that
allows subscribers to exchange multimedia files as messages.
MMS supports the
transmission of various media types: text, picture, audio, video, or a
combination of all four. The originator can easily create a Multimedia Message,
by snaping a photo with the phone camera, or by using images and sounds stored
previously in the phone (or downloaded from a web site).
If the recipient
phone is not switched on or it has not been setup to receive MMS messages, the
Multimedia Message will be stored in a special repository offered by the GSM
carrier.
In order to send or
receive a MMS, the user must have a compatible phone that is running over a
GPRS or 3G network. Most current mobile phones and operator networks support
MMS.
The maximum message
size (along with the attachments) is generally limited to 300KB (MMS 1.2), but
recently the MMS 1.3 standard has allowed for a maximum size of 600KB. Wireless
carriers however can impose their own size restrictions. Whenever possible we
will try and state the MMS version supported by the individual handsets in our
database.
Mobile games
Many phones include
simple games for the user to pass the time. The games referred to here are ones
preinstalled on the phone and do not require a wireless connection to play.
With mobile phones
getting ever more powerful, the games are following suit in terms of complexity
and graphics. Some phones even have dedicated gaming keys and even look like
portable mini gaming consoles.
Some of the latest
phones have a built-in accelerometer sensor, which can be utilized by games to
provide more interactive gameplay. In those so-called motion-based games, you
can steer, for instance, by tilting your phone in the respective direction.
Usually, when there
are some games preinstalled, more can be downloaded over the air using the
phone's built-in web browser or they can be downloaded onto a desktop computer
and then transferred to the mobile phone via a data cable.
There are several
different technologies for downloadable games for feature phones, including
Java, BREW, Mophun, and WGE. The technologies are incompatible between each
other, although some phones support more than one of them.
Additionally, native
mobile games for smartphones with their respective mobile OSs also represent a
large share of the mobile game market.
Bear in mind that a
certain mobile phone model can be bundled with different games depending on the
regional market or even the network carrier.
Mobile IM (Instant
Messaging)
Mobile Instant
Messaging is the ability to engage in Instant Messaging services from a mobile
handset. Mobile IM allows users to address messages to others using a dynamic
address book full of users with their online status updated constantly. That
allows anyone participating to know when their "buddies" are
available for chat.
The advantage of
mobile IM is that messages are sent and received in real-time via mobile
handsets on-the-go without a stationary computer. Mobile IM is seen as a
natural evolution of the popular SMS service.
Mobile IM is
available from some operators or mobile phone manufacturers now, but unfortunately,
it is not always possible to use IM services between different operators.
When we state IM in
our specs sheet that usually means the phone is equipped with a proprietary IM
solution. Those solutions frequently rely on either carrier support or can be
used between users with handsets of one and the same make.
Fortunately, popular
third-party IM providers such as ICQ, Skype, Google Talk, MSN, AOL, Yahoo, etc.
are alleviating the situation by making their own mobile applications allowing
mobile phones to engage in Instant Messaging independently of their carrier or
mobile phone manufacturer. The only prerequisite is having internet access on
the go - over GPRS or 3G.
Mobile WiMAX
Mobile WiMAX (WiMAX
comes from "Worldwide Interoperability for Microwave Access") is a
technical wireless standard allowing web browsing and wireless data transfer on
the move. It's an another way of calling the 802.16e protocol.
WiMAX technology
provides the equivalent of broadband speeds without the need for cables, and service
coverage can extend over an entire city, region or even a whole country.
Access to the WiMAX
wireless service is subject to a monthly subscription and it requires the use
of a dedicated WiMAX modem, which is usually supplied for free by the operator.
WiMAX technology
allows for data transfer speeds of up to 75Mbps, but in reality they tend to be
a lot lower than that, at around 1-10 Mbps tops.
Modem
Comes from
"MOdulator/DEModulator". A device or a component of a device used for
transferring information. Information is encoded (the modem modulates the
signal) and decoded (the signal is being demodulated) so it can be transmitted
easily over a network (wireless, as well).
Monochrome
Literally "one
color". A monochrome display is commonly known as a black and white or
grayscale display. In mobile phones such black-and-white displays often utilize
a colored backlight such as green, blue or orange.
Monochrome displays
are no longer used for primary displays in mobile phones, but some are still
used as external secondary screens.
MP3 (MPEG Layer 3)
An audio storage
protocol that stores music in a compressed format with very little loss in
sound quality.
MP3 is the most
common MPEG format for audio files. MP3 files can be played using the music
player of the mobile phone or set as a ringtone.
MPEG (Motion Picture
Experts Group)
A wide range of
formats for digital audio and video files. The most common among them are
MPEG-4 (for video) and MP3 (for audio).
MPEG-4 video
MPEG-4 is one of the
latest video/audio compression method standardized by MPEG group, designed
specially for low-bandwidth (less than 1.5MBit/sec bitrate) video/audio
encoding purposes.
MPEG-4 is designed to
deliver DVD-quality video (MPEG-2) at lower data rates and smaller file sizes.
It should be noted
that unlike MPEG-1 and MPEG-2, the MPEG-4's predecessors, MPEG-4 itself isn't
just one unified encoding mechanism, but rather a group name for several
flavors of video and audio encoding methods that share certain same
characteristics. These "flavors" are often referred either as
"profiles" or "layers" in MPEG-4 compression scheme and
each new profile should be backwards compliant to the older, "lower"
versions of MPEG-4 in terms of playback capability.
Probably the
best-known MPEG-4 video encoders are called DivX and XviD, which both are
nowadays fully standard-compliant MPEG-4 encoders. The most common MPEG-4
profiles that both XviD and DivX use extensively are called "simple profile"
and "advanced simple profile".
Beside those two
standardized video encoding profiles, the MPEG-4 group has standardized several
other profiles. The most important ones are H263+ (which is used widely in
mobile phones, dubbed as 3GP) and H.264 (often also called as AVC or more
technically known as MPEG-4 Part 10).
Since MPEG-4 is a
container format, MPEG-4 files may contain any number of audio, video, and even
subtitle streams, making it impossible to determine the type of streams in an
MPEG-4 file based on its filename extension alone.
The official filename
extension for MPEG-4 Part 14 files is .mp4, thus the container format is often
referred to simply as MP4. However various file extensions are also commonly
used to indicate the content inside the MP4 container:
·
MPEG-4
files with audio and video generally use the standard .mp4 extension.
·
Audio-only
MPEG-4 files generally have a .m4a extension. This is especially true of
non-protected content.
·
MPEG-4
files with audio streams encrypted by FairPlay Digital Rights Management as
sold through the iTunes Store use the .m4p extension.
·
Audio
book and podcast files, which also contain metadata including chapter markers,
images, and hyperlinks, can use the extension .m4a, but more commonly use the
.m4b extension. An .m4a audio file cannot "bookmark" (remember the
last listening spot), whereas .m4b extension files can.
·
Raw
MPEG-4 Visual bitstreams are named .m4v.
·
Mobile
phones use 3GP, a simplified version of MPEG-4 Part 12 (a.k.a MPEG-4/JPEG2000
ISO Base Media file format), with the .3gp and .3g2 extensions. These files
also store non-MPEG-4 data (H.263, AMR, TX3G).
The common but
non-standard use of the extensions .m4a and .m4v is due to the popularity of
Apple's iPod, iPhone, and iTunes Store, and Microsoft's Xbox 360 and Zune.
Without mods, Nintendo's DSi and Sony's PSP can also play M4A.
Multitouch input
method
In mobile computing,
multi-touch refers to the capability of a touchscreen (or a touchpad) to
recognize two or more points of contact on the surface concurrently. The
constant tracking of the multiple points allows the mobile phone interface to
recognize gestures, which enable advanced functionality such aspinch-to-zoom.
The multi-touch
sensing doesn't work on the resistive type of touchscreens (budget touch
phones), the capability comes inherited in capacitive touchscreens (majority of
touch phones nowadays).
Apple is considered
the pioneer of multi-touch technology on mobile phones with their first iPhone.
They introduced the pinch-to-zoom gesture that is now available across various
platforms.
Music playback time
(battery life)
Music playback time
is the officially quoted longest time that a single battery charge will last
when you use the phone as a music player only.
Usually those numbers
are only achievable when the phone is set to Flight mode (i.e. all transceivers
are off) and the headphones are used (as opposed to the loudspeaker). These
numbers are best used as reference when comparing phones from the same
manufacturer because battery life measurement methodology will probably vary
from manufacturer to manufacturer.
Music Player
A mobile phone
application that allows you to listen to music files stored in the phone's
internal or external memory.
N
NAND Memory
NAND memory is a
popular type of flash memory.
Flash memory is
non-volatile computer memory that can be electrically erased and reprogrammed.
Non-volatile means that no power is needed to maintain the information stored
in the chip.
Flash memory is a
technology that is primarily used in memory cards and USB flash drives as solid
state storage and its main purpose is being an inexpensive way of storing or
transferring data between computers and other digital products. It's used as
primary storage memory on various portable devices due to its low cost, compact
size, high physical endurance and low power consumption.
Another popular type
of flash memory is NOR flash memory.
Network capacity
Network capacity is
the amount of traffic that a network can handle at any given time. This
includes the number of simultaneous voice calls and maximum data speeds.
Capacity varies by area.
Network coverage
The geographical area
covered by the network of a service provider. Within this area, the phone will
be able to complete a call using the carrier's network or a partner network.
NFC (Near Field
Communication)
NFC is a short-range
high frequency wireless communication technology that enables the exchange of
data between devices over about a 10 cm distance.
NFC is an upgrade of
the existing proximity card standard (RFID) that combines the interface of a
smartcard and a reader into a single device. It allows users to seamlessly
share content between digital devices, pay bills wirelessly or even use their
cellphone as an electronic traveling ticket on existing contactless
infrastructure already in use for public transportation.
The significant
advantage of NFC over Bluetooth is the shorter set-up time. Instead of
performing manual configurations to identify Bluetooth devices, the connection
between two NFC devices is established at once (under a 1/10 second).
Due to its shorter
range, NFC provides a higher degree of security than Bluetooth and makes NFC
suitable for crowded areas where correlating a signal with its transmitting
physical device (and by extension, its user) might otherwise prove impossible.
NFC can also work
when one of the devices is not powered by a battery (e.g. on a phone that may
be turned off, a contactless smart credit card, etc.).
NiCd (Nickel Cadmium)
Used to describe an
early inexpensive rechargeable battery type which, if not completely discharged
before charging, can suffer from the so called "memory effect" that
reduces the battery's life.
NiMH (Nickel Metal
Hydride)
Used to describe a
rechargeable battery type which, if not completely discharged before charging,
can suffer from the so called "memory effect" that reduces the
battery's life. The NiMH-batteries can hold more power than the NiCd-ones, and
also suffer much less from the "memory effect" than NiCd-batteries.
NOR Memory
NOR flash memory is
one of the two popular types of flash memory. The other is the newer NAND flash
memory.
Flash memory is
non-volatile computer memory that can be electrically erased and reprogrammed.
Non-volatile means that no power is needed to maintain the information stored
on the chip.
Flash memory is a
technology that is primarily used in memory cards and USB flash drives as solid
state storage and its main purpose is an inexpensive way of storing or
transferring data between computers and other digital products. It's used as
primary storage memory on various portable devices due to its low cost, compact
size, high physical endurance and low power consumption.
Numeric keypad
A standard phone
keypad consisting of the numbers from 0 to 9 and including the signs
"*" and "#".
Alphanumeric keypads
are an upgrade to those and are used to enter text as well as numbers. They
include alphabet characters - usually several letters are assigned to each of
the numeric keys - and you can toggle their input by pressing the corresponding
key several times, often referred to as "multi-tap" input.
O
OEM (Original
Equipment Manufacturer)
A company
manufacturing products that are branded and sold by another company. Often if
the product was originally designed by the OEM that is called an ODM (Original
Design Manufacturer).
OLED (Organic
Light-Emitting Diode)
A display technology
that consists of small dots of organic polymer which emit light when charged
with electricity.
OLED displays have
several advantages over the LCDs. They are thinner, lighter, brighter, need
less power, have better viewing angles, contrast and response time for video
and animation. OLEDs are also cheaper and easier to manufacture.
On the other hand,
LCDs offer better legibility in bright ambient light.
Optical Zoom
The zoom-feature
found in many cameras and camera phones that makes subjects appear closer than
they actually are (so they fill more of the image area). To create that
magnification effect cameras use a set of moving optical lenses - hence the
name "optical zoom".
The alternative to
optical zoom is digital zoom, which is a highly advertized feature on many
consumer devices equipped with a camera, but it doesn't offer many real
advantages.
Digital zoom
generally influences quite negatively the image quality of the captured images.
OS (Operating System)
An infrastructure
software component of a computerized system. It controls all basic operations
of the computer (or other electronic devices such as PDA, smartphone, etc.).
Among the most
popular desktop operating systems are Windows, Mac OS, and variations of Linux,
while the most widely used operating systems for mobile devices are Symbian and
Windows Mobile.
Mobile devices with
OS are called smartphones and can run full software applications (like games,
organizer or communication applications) on top of the OS. Standardized
operating system platforms make it possible to provide a consistent user
interface (and experience) across devices from diverse hardware manufacturers.
OTA (Over-The-Air)
Over-the-air is any
method of making data transfers or transactions wirelessly using the cellular
network instead of a cable or other local connection.
Most commonly, this
term refers to downloading or uploading content or software (such as downloading
ringtones, uploading images, etc.).
If the term is used
for updating a phone's firmware this is also known as FOTA (Firmware
Over-The-Air).
P
Packet Data
Packet Data - small pieces called packets. This allows users to consume a
network's resources only when they are actually transferring data. In mobile
phones, data is used for functions requiring Internet access (including video
or audio streaming).
Generally all technologies for wireless data transfer used by operators
(except WAP) rely on packet data - GPRS, EDGE, UMTS.
Pager
A small pocket-sized
one-way or two-way radio receiver that rings and/or vibrates when a
transmission is received. Optionally, it can also display a numeric and/or
alphanumeric message. Some pagers are capable of not only receiving but also
sending messages.
PC Sync
A feature allowing
the user to connect the mobile phone to a computer (via cable or wirelessly
using Bluetooth for example) and synchronize contact information, calendar and
notes between the phone and a specific computer application (such as MS Outlook
on PC).
PCS (Personal
Communications Service)
PCS or Personal
Communications Service is the name for the 1900 MHz radio band used for digital
mobile phone services in Canada, Mexico and the United States.
All CDMA, GSM, and
D-AMPS systems can be used on PCS frequencies.
PDA (Personal Digital
Assistant)
A handheld device
with basic computing and organizing functions. Most of them have a large touch
screen, a stylus and support handwriting recognition.
Normally, they also
have faster processors than typical mobile phones and can run more complex
software. Most of the PDAs run a standardized OS such as Windows Mobile for
Pocket PC or Palm OS.
Today, PDAs are being
pushed aside by capable smartphones, which can do all the same functions but
also offer telephony.
Phone Book Access
(PBA)
A Bluetooth
mode/profile allowing the phone to make its phone book (contact) information
available to another authorized and PBA compatible device (car or car accessory
e.g.). PBA allows the authorized device to handle phone book browsing and
dialing (including voice dialing by the car or car accessory).
Phonebook
Mobile phones are
equipped with a quite detailed phonebook. The available information fields
usually cover all the customary PIM requirements. Most of the times users can
even add custom fields when the default options are insufficient.
Computer
synchronization with a PIM application is quite important and most recent
mobile phones offer synchronization with Microsoft Outlook or through a
proprietary sync application.
Whenever possible we
will try and list the contact capacity for each mobile phone in our database as
accurately as possible.
Bear in mind that the
number of entry fields listed concerns only the handset memory, SIM cards will
usually offer an additional capacity of about 200-250 contacts.
PIM (Personal
Information Manager/Management)
A whole range of
software functions which organize personal information. A standard PIM suite
includes a scheduler for events, address book for contacts and a to-do list.
Email, text notes and/or voice notes, and alarms (reminders) may also be
included. Some mobile phones allow PIM data to be synchronized (also
automatically) with a PC and/or web-based PIM-service.
PIN code (Personal
Identification Number)
In mobile devices,
the PIN acts like a password preventing other people from gaining unauthorized
access to your device. This is a numeric code which must be entered each time
the device is started (unless the PIN security feature is turned off).
In GSM mobile phones,
the PIN is normally associated with the SIM card (not the phone) and must be
entered each time the phone is switched on. If a wrong PIN is entered three
times in a row the handset is locked until you enter another code, called a PUK
code.
Both the PIN and the
PUK codes are supplied by the operator, but only the PIN code can be changed by
the user.
Pixel
Pixel comes from
"pix" (for "picture") and el (for "element"). A
pixel is the smallest piece of information on an image. This is a unit for
measuring image resolution, and the more pixels a picture consists of, the more
detailed it is.
Pixel density (PPI)
Refers to the
concentration of pixels on a particular display, measured in pixels per inch
(ppi). Pixel density is calculated by dividing the diagonal pixel resolution of
a display by its diagonal size.
Polyphonic ringtones
With polyphonic
ringtones more than one musical note is played at the same time.
Unlike regular
ringtones, which can only reproduce consecutive notes (monophony), the
polyphonic ringtones are able to create realistic-sounding music by
synthesizing several notes simultaneously - polyphony. The more notes the
synthesizer can play simultaneously, the nicer it sounds. Usually mobile phones
synthesizers can reproduce from 4 to 72 simultaneous tones.
Polyphonic ringtones
should not be mistaken with the so called "True tones" (also known as
"Real tones") which are simply audio recordings, typically in a
common format such as MP3, AAC, or WMA.
POP3 (Post Office
Protocol)
An Internet protocol
used to download messages from an email server to an email client (a desktop
computer or mobile device application).
Port
A term that is
generally used to describe a physical connector that docks with another
connector (a type of plug on the end of a cable) to electronically connect two
devices. It is also called a "connector" or "jack".
Predictive text input
Allows the user to
enter text by pressing only one key per letter on a keypad where multiple letters
share keys. As a word is entered, the phone automatically compares all possible
letter combinations against a built-in dictionary of words, and determines
which word was intended to be typed by the user.
It is possible to
scroll (without re-typing) through all possible matches until the right word is
found. This feature allows faster and easier typing than the standard typing
method where some keys must be pressed several times until the right letter is
displayed on the screen (a.k.a. multi-tap).
The most popular
types of predicative text entry are T9 and Motorola's iTAP.
PTT (Push-To-Talk)
A two-way
communication service which works like a "walkie-talkie".
PTT is half-duplex so
communication can only be transferred in one direction at a time in contrast to
mobile phone calls which are full-duplex and both parties can hear each other.
PTT requires the
person speaking to press a certain button while talking and to release it when
they are done so the listener can answer by repeating the same steps. In this
way people control which one can speak and be heard and the system knows in
which direction the information should be transferred.
Most PTT systems
allow group calls (one person speaks to all the members of the group).
The newest PTT
systems use VoIP technology and the signal is transferred over the 2.5G or 3G
network.
PUK Code (PIN UnlocK
Code)
A PUK code is
required if a GSM SIM card was locked after entering the wrong PIN code three
times in a row. Entering a wrong PUK code ten times in a row disables the SIM
card permanently. Both the PIN and the PUK codes are supplied by the operator,
but only the PIN code can be changed by the user.
Push
A general term
referring to technologies which allow a central system (such as the network) to
"push" (send) information spontaneously and quickly to a user without
any action on the part of the user or the mobile device.
A very common
"push" technology is email. "Push" emails are directly
"pushed" to the mobile device as soon as the email server receives
them and it is not necessary for either the user or the device to manually or
automatically check for new emails at regular intervals.
Q
QCIF
(Quarter Common Intermediate Format)
QCIF images or videos are 176 pixels wide and 144 pixels tall (176 x 144
pixels). The name Quarter CIF is written as QCIF and the resolution is four
times smaller than the CIF resolution (352 x 288 pixels). QCIF is smaller than
CIF, QVGA, and VGA.
Quad-band
Refers to a mobile
phone that supports the four major GSM frequency bands (850/900/1800/1900 MHz),
making it compatible with all the major GSM networks in the world. The 850/1900
MHz bands are mainly used in the US, while the 900/1800 MHz ones are available
in most other countries worldwide.
QVGA (Quarter Video
Graphics Array)
QVGA images or videos
are 320 pixels wide and 240 pixels tall (320 x 240 pixels). The name Quarter
VGA is written as QVGA and the resolution is four times smaller than VGA
resolution (640 x 480 pixels).
QWERTY keyboard
layout
Stands for a standard
layout for letter keys on text keyboards. This term comes from the first six
letter on the top row of a standard English keyboard and refers to devices that
offer a keyboard with that kind of layout.
Such a keyboard makes
typing much easier and faster even though sometimes (on mobile devices such as
mobile phones) keys are small and placed too close to each other.
R
RAM (Random-Access
Memory)
This is the memory
where the software resides while it is running along with the data it is using.
RAM is used by both OS and application software.
RAM is very fast but
volatile, meaning that all information is lost when electric power is cut off.
That makes it useful for temporary storage of data that requires fast access.
Normally, devices
with RAM also have another type of storage memory (flash memory or a hard
drive) that stores the information while the power is off.
Devices with more RAM
can run more complex software and multiple applications at the same time.
RBDS (Radio Broadcast
Data System)
Radio Broadcast Data
System is the official name used for the U.S. version of RDS, though the
"RDS" name seems to be at least as common in daily usage. The two
standards are nearly identical, with only slight differences, mainly in which
numbers are assigned to each of the 31 music and other program formats the RBDS
system can identify.
Generally, mobile
phone RDS implementations make use only of Radio Text info. It's 64-character
free-form textual information that can be either static (e.g. station slogans)
or in sync with the programming such as the title and artist of the
currently-playing song.
Mobile phone FM
tuners don't receive some of the RDS information that may be available, such as
time, program type (PTY) or traffic announcements (TA/TP).
RDS (Radio Data
System)
Radio data system or
RDS is a standard for sending small amounts of data through conventional FM
radio broadcasts. The RDS system standardizes several types of information
transmitted, including track/artist info and station identification.
Resistive touchscreen
Resistive
touchscreens operate by sensing direct pressure applied by the user. It can be
activated by pressing it not only with a finger but also with a stylus (unlike
the competing capacitive technology).
A resistive touch
screen consists of a touch layer placed on top of a standard display. The touch
layer normally includes two transparent electrical layers separated by a small
gap.
Pressing the
display's surface causes the two separate layers to come into contact, which
creates an electrical connection that can be sensed and located.
Resolution
A term that refers to
the number of pixels on a display or in a camera sensor (specifically in a
digital image). A higher resolution means more pixels and more pixels provide
the ability to display more visual information (resulting in greater clarity
and more detail).
Resolution does not
refer to the physical size of the display, camera sensor or image. For example,
two displays with the same resolution can have different physical dimensions.
And since there will be more pixels per inch on the smaller one, the image
provided by it should be clearer and more detailed (although graphics will be
physically smaller).
Ringer ID
Allows users to
assign specific ringtones to individual phone book entries so they can be identified
by the ringtone when calling.
Ringing profiles
Features allowing
users to create distinct profiles consisting of detailed ringer settings. Those
profiles can be easily accessed and activated when needed.
A wide array of
options can be changed by the user in each profile (such as tones, vibration,
melodies, ringer volume, etc.) and changes take effect all at the same time
when this profile is activated.
Ringtone
That is the sound
that a phone makes to indicate an incoming call.
Roaming
Refers to using a
mobile phone outside of your service provider's coverage area. Typically,
service providers charge higher fees for calls, messages and access to the
Internet.
ROM (Read-Only
Memory)
A form of data
storage. This type of memory keeps the saved data even if the device power is
off. The data on the ROM can be loaded into the RAM if needed.
The word Read-Only
identifies it as "read-only memory", since the reprogramming process
is generally infrequent, comparatively slow, and often does not permit random
access writes to individual memory locations.
RS-MMC (Reduced-Size
Multi Media Card)
A type of memory card
that was popular in the past.
Memory cards are
based on Flash memory and are used as solid state storage, their main purpose
being an inexpensive way to store or transfer data between computers and other
digital products.
RS-MMC are based on
the MMC standard and share their form-factor and size with MMCmobile cards. The
difference between the two formats is that MMCmobile cards are dual-voltage and
can operate in older phones with a high-voltage (3V) slot as well as in newer
models with a low-voltage (1.8V) slot. Traditional RS-MMC cards can only work
in devices with a high-voltage (3V) slot.
RSA (Rural Service
Area)
A geographic area of
population defined by the US Census Bureau. RSA stands for areas which are not
within an MSA (Metropolitan Statistical Area). Both divisions were used by the
FCC to geographically separate cellular frequency licenses granted to wireless
carriers in the 1980s.
RSS (Rich Site
Summary)
A family of XML-based
web feed formats used to publish frequently updated information such as news
headlines, blog entries, etc.
RSS feeds are very
lightweight (especially compared to full web pages) and are ideal for mobile
devices which often suffer from limited bandwidth and screen size.
A special software
(called RSS-reader) is needed for the RSS feeds to be displayed.
Ruggedized (Rugged)
Ruggedized devices
(e.g. mobile phones) offer protection against rough use and/or a rough environment.
For example, such devices are normally resistant to shock, water and dust. In
order to measure the level of protection manufacturers usually get standard
certificates in one or several of the available systems. Such standardization
systems include the US Military Standard (MIL-STD or Mil-Spec) or the Ingress
protection rating (IP).
S
S60 user interface
S60 (formerly known
as Series 60) is one of the major smartphone user interfaces. It is developed
mainly by Nokia and uses the Symbian OS as its base. Besides using it in all of
its own smartphones, Nokia also licenses S60 to other manufacturers such as
Samsung and LG.
S60 is capable of
running native third-party S60 applications as well as regular Java
applications.
There are several
releases of the S60 UI and chronologically they include Series 60 (2001),
Series 60 Second Edition (2004), Series 60 3rd Edition (2005) and S60 5th
edition (2008).
Thrid-party software
written for S60 1st Edition (S60v1) or 2nd Edition (S60v2) is not compatible
with S60 3rd Edition (S60v3) and later because it uses a new version of the
Symbian OS (v9.1).
The latest S60 5th
edition was announced in October 2008. Nokia decided to move directly from the
3rd Edition to the 5th Edition "as a polite gesture to Asian customers"
since the number four is considered bad luck in some Asian cultures.
The major feature of
S60 5th Edition is support for high-resolution 640x360 touchscreens. Before the
5th Edition, all S60 devices had a button-based user interface.
S60 5th edition has
some support for third-party software developed for S60 3rd edition but, it's
currently limited and somewhat hit-and-miss.
SAP (SIM Access
Profile)
SIM Access Profile is
a Bluetooth profile allowing a GSM phone to share its SIM card with another
device of the same type.
SAR (Specific
absorption rate)
Each GSM handset has
a radio transmitter and receiver in order to operate in the wireless GSM
network. That transceiver is manufactured so that when used next to the ear and
when worn on the belt, it won't exceed the limits for exposure to radio
frequency energy set by the authorities.
The authorities in
question here are the Federal Communications Commission (FCC) of the U.S.
Government, Industry Canada of the Canadian Government (IC), and the Council of
the European Union.
These limits are part
of comprehensive guidelines that establish permitted levels of RF energy for
the general population. The guidelines are based on standards that have been
developed by independent scientific organizations through periodic and thorough
evaluation of scientific studies.
The exposure standard
for wireless devices employs a unit of measurement known as the Specific
Absorption Rate, or SAR. Unfortunately the limits set by the FCC/IC and the
Concil of the European Union are measured over different amount of tissue so
they are not directly comparable.
·
The SAR
limit set by the FCC/IC is 1.6W/kg averaged over 1 gram of actual tissue.
·
The SAR
limit recommended by the Council of the European Union is 2.0W/kg averaged over
10 g of actual tissue.
Although the SAR is
determined at the highest certified power level, the actual SAR level of the
device while operating can be well below the maximum value. This is because GSM
phones are designed to operate at multiple power levels so as to use only the
power required to reach the network. In general, the closer you are to a
wireless base station antenna, the lower the power output of the device and
vice versa.
You will
find we list several SAR values. The reason for that is the FCC/IC have
stipulated that SAR should be measured at both hip level (making calls while
carrying the phone at the waist) and at head level (making calls with the phone
put next to ear). So you are almost certain to see two SAR values for the
FCC/IC standard.
The Council
of the European Union only requires the measurements at ear level so most
manufacturers don't measure SAR at hip level for European models. So in this
case you are almost certain to see a single SAR value only for the EU standard.
Screen protection
As touchscreen
displays are growing larger in recent years, the need for enhanced scratch
resistance and protection of the screens created the demand for usage of screen
covers of increased resistance including chemically hardened glass.
Corning's Gorilla Glass
is a popular brand of hardened glass used for high-end handset in the mobile
industry.
Additionally,
manufacturers has started applying oleophobic coating on top of its screens to
make finger smudges less of an issue.
SD (Secure Digital)
Secure Digital or SD
is a popular type of memory card. Memory cards are based on Flash memory and
are used as solid state storage, their main purpose being an inexpensive way to
store or transfer data between computers and other digital products.
The dimensions of an
SD card are 24 x 32 x 2.1 mm, which makes it smaller than CompactFlash but
larger than miniSD, microSD (TransFlash) and RS-MMC.
SD cards are about
the same size as MMC but a bit thicker. They provide a bit more speed than MMC
at the expense of higher power consumtion. SD cards also provide a hardware
lock that can protect the stored data from being erased.
Secondary camera
This refers to a
second, usually lower-resolution camera, typically positioned on a device so as
to face the user in applications such as video conferencing.
Sensors
Modern mobile phones
come with a variety of sensors that automate or easy many of our daily tasks.
This field takes into account the presence of an accelerometer, a gyroscope, a
compass, and a barometer.
Accelerometer
and gyroscope
Accelerometers in
mobile phones are used to detect the orientation of the phone. The gyroscope,
or gyro for short, adds an additional dimension to the information supplied by
the accelerometer by tracking rotation or twist.
An accelerometer
measures linear acceleration of movement, while a gyro on the other hand
measures the angular rotational velocity. Both sensors measure rate of change;
they just measure the rate of change for different things.
In practice, that
means that an accelerometer will measure the directional movement of a device
but will not be able to resolve its lateral orientation or tilt during that
movement accurately unless a gyro is there to fill in that info.
With an accelerometer
you can either get a really "noisy" info output that is responsive,
or you can get a "clean" output that's sluggish. But when you combine
the 3-axis accelerometer with a 3-axis gyro, you get an output that is both
clean and responsive in the same time."
Digital
compass
The digital compass
that's usually based on a sensor called magnetometer provides mobile phones
with a simple orientation in relation to the Earth's magnetic field. As a
result, your phone always knows which way is North so it can auto rotate your
digital maps depending on your physical orientation.
Barometer
And finally, you may
see a device sporting a barometer in its specs sheet. Contrary to what you may
suggest, it has nothing to do with weather. Instead, the barometer is there to
help the GPS chip inside the device get a faster lock by instantly delivering
altitude data.
Side Keys
The side keys are the
buttons situated on the sides of the phone that you can use while holding the
phone in one hand.
SIM
A subscriber identity
module is a removable smart card for mobile phones. SIM cards store the
required information to identify the mobile device. It also contains data
required for voice encryption to make listening in on calls almost impossible
(except when the wireless carrier itself is doing the eavesdropping).
In this way the
customer ID (and personal number) is tied to the SIM card and not to a certain
mobile phone. This allows for a seamless interchange of the same SIM card
between different GSM mobile phones.
SIM cards also serve
as storage for SMS messages and the user's contacts. Current SIM cards can
store up to 250 name/number pairs and up to 50 SMS text messages.
The SIM card cannot
store multiple numbers per contact or other more complex information. This
means that if you copy your contacts info from the phone memory to the SIM
memory, contacts get broken up into as many entries as there are numbers for
each individual contact and discards the other information.
All GSM phones and
most iDEN phones require a SIM card to operate.
There are certain
types of phones (CDMA, TDMA, AMPS) that do not use a SIM. Instead, the required
data is programmed directly into the phone.
The SIM cards come in
two standard sizes: the first one 85.60 x 53.98 x 0.76 mm and the newer and far
more popular version 25 x 15 x 0.76 mm.
There are two numeric
passwords associated with a SIM card. One is the Personal Identification Number
(PIN) that the user must input each time they start the device (this can be
turned off via the phone settings).
When entering the PIN
number the user has only three input attempts. If all three are incorrect, the
card gets locked and a PUK (Personal Unblocking Key) must be entered in order
for the card to work again. Only ten attempts to enter the PUK are permitted
before the card is permanently locked and made unusable.
SIM lock
GSM phones can be
"locked", that is made to accept only SIM cards belonging to a
specific network. Typically, this is done so that phones will work only on the
network of the carrier.
SIM-locked phones are
usually locked to a carrier when the carrier sells the device at a subsidized
price in order to attract new subscribers to its services.
Some carriers offer a
SIM unlock option to their subscribers after a certain amount of time has
passed. Unlocking the phone can be done by entering a special code which is
generated based on the phone's unique IMEI number.
Some third-party
shops offer unauthorized unlocking of SIM-locked phones, but using their
services usually voids the official warranty of the phone.
Single-Band
A single-band phone
is one that operates on one frequency only. This makes the phone unable to
operate in areas where the service providers do not support its frequency.
Skin
See Theme.
Smartphone
A smartphone is a
term used to describe a category of mobile devices with computer-like functionality.
These devices sport complete operating system and have a platform for
application developers.
Currently, the two
major smartphone platforms in use are Android (by Google) and iOS (by Apple).
An application written for a specific platform can usually work on any
smartphone using the same platform.
Applications for
smartphones are also faster and better integrated with the phone's UI than Java
applications. Smartphones have larger displays and faster processors than
so-called feature phones or dumb phones .
SMIL
Synchronized
Multimedia Integration Language is a standard for interactive audiovisual
presentations and is commonly used in mobile phones' MMS messaging. These
messages integrate text with images and audio/video streaming. The abbreviation
SMIL is read as "smile". A typical SMIL presentation consists of
multiple "slides" playing in sequence.
SMS (Short Messaging
Service)
SMS or the Short
Messaging Service allows users to send and receive personal text messages
directly between mobile phones or sometimes to email adresses. Each message can
be up to 160 characters long (when using the default character set) and can be
sent to and from users of different operator networks. All mobile phones
support SMS.
Recently mobile
manufacturers have started offering special reading layouts for SMS inspired by
Instant Messengers such as ICQ, Skype, and MSN. The so-called threaded message layout orconversation-style layout displays the incoming and outgoing
messages between two participants in a single pane ordered chronologically.
This enhancement
reflects the recently prevalent use of SMS as a type of instant messaging much
like you would chat on a computer. When possible we try to explicitly state
that a mobile phone supports this enhanced messaging view.
SNS (Social network
service)
A social network
service or social networking service, most often called SNS, is a medium for
establishing social networks of people who share interests and/or activities.
Social networking
sites allow users to share ideas, activities, events, and interests within
their individual networks. Most social network services are web based and
provide means for users to interact in various ways, such as e-mail and instant
messaging.
Modern
internet-connected always-online phones stake a lot on SNS connectivity and
integration with the various services getting more popular than ever.
Soft keys
Soft keys (a.k.a
context keys) are keys with varying functionality depending on the context they
are used in. These are usually situated right under the display and their
current function is shown above it.
Soft Reset
A Soft Reset is the
act of rebooting or restarting your device in order to clear its internal
(non-storage) memory of running programs. This is a way to start afresh if an application
is causing problems and is normally only used on smartphones.
Windows Mobile
smartphones usually have a dedicated soft reset pinhole that can only be
pressed with a sharp, pointed object such as a stylus. It's designed to perform
a soft reset when the device becomes unresponsive.
Speed Dial
A feature present on
all mobile phones that allows the user to program a button from the
alphanumeric keypad to automatically dial a custom phone number upon a longer
press.
Stand-by time
(battery life)
Stand-by time is the
officially quoted longest time that a single battery charge will last when the
phone is constantly connected to the GSM network but is not in active use.
The stand-by time is
highly dependent on the cellular network environment, such as the distance to
the closest GSM cell tower (base station). Moving the phone (as in a vehicle)
also negatively affects battery life.
Manufacturers measure
talk time in controlled conditions and the quoted numbers are rarely reached in
real-life scenarios. These numbers are best used as reference when comparing
phones from the same manufacturer because battery life measurement methodology
will probably vary from manufacturer to manufacturer.
Quite often you will
find the Stand-by time field in the specification pages of new phones empty as
the manufacturers sometimes fail to disclose the info at the official
announcement. Later on when the handset hits the market, the figures are
usually revealed and accordingly, we take the care to add them to the database.
Stereo Speakers
Stereo speakers are
two speakers built into a single device. They are usually positioned on the
left and right side of the device and each speaker uses the respective channel
of stereo sound, thus producing a stereo effect.
Streaming Video
Streaming video is a
feature that allows real-time viewing of web video on a mobile device. This
allows users to enjoy a video without downloading it prior to watching.
Stylus
A small mechanical
tool used to work with touch-screen devices. It is usually a simple stick of
plastic or metal in the shape of a thin pen which has a softened tip so that it
does not damage the screen.
Because of its
familiar shape, handwriting and drawing on the touch-screen is much easier for
the user, and it achieves far greater accuracy than a fingertip.
Sub-QCIF
Sub-quarter common
intermediate format is the smallest standard image size. With its resolution of
128 x 96 pixels, it provides low-resolution video clips and streaming video on
mobile phones.
SVGA
Super video graphics
array is a standard size for images and displays. SVGA indicates a resolution
of 800 x 600 pixels.
Symbian
Symbian OS is an
operating system designed for mobile devices.
The Symbian OS is
used as the underlying base for two major smartphone platforms: S60 and UIQ.
Generally, applications written for one of these platforms are not compatible
with the other but as they use the same underlying OS it is easier for
developers to convert applications from one of them to the other. The Symbian
OS introduced major changes to version 9 that made all previous software
incompatible without updating. The platforms based on Symbian subsequent to
version 9 are the UIQ 3.0 and later, as well as S60 3rd edition.
SyncML
SyncML is a standard
for personal organizer data synchronization between different devices. This can
cover any type of personal organizer data, such as contacts, to-do lists, notes
etc.
The devices
synchronized can be mobile devices (phones, PDAs) as well as stationary ones
(PCs). SyncML even enables synchronization with web sites as it features an
XML-based standard that all SyncML-compatible devices can recognize.
T
Talk time (battery
life)
Talk time is the
officially quoted longest time that a single battery charge will last when you
are constantly talking on the phone.
The talk time is
highly dependent on the cellular network environment such as the distance to
the closest GSM cell tower. Moving fast while talking (as in a vehicle) also
negatively affects battery life.
Manufacturers measure
talk time in controlled conditions and the quoted numbers are rarely reached in
real-life scenarios. These numbers are best used as reference when comparing
phones from the same manufacturer because battery life measurement methodology
will probably vary from manufacturer to manufacturer.
Quite often you will
find the Talk time field in the specification pages of new phones empty as the
manufacturers sometimes fail to disclose the info at the time of the official
announcement. Later on, when the handset hits the market, the figures are
usually revealed and accordingly, we take the care to add them to our database.
TCP/IP
Transmission Control
Protocol and Internet Protocol are in fact two cooperating protocols that are
essential parts of the Internet protocol set. The TCP breaks the data into
packets while the IP routes them.
TD-SCDMA (Time
Division-Synchronous Code Division Multiple Access)
TD-SCDMA is a 3G
format of choice for the national standard of 3G mobile telecommunication in
China. TD-SCDMA was chosen as an attempt to escape dependency on the already
implemented Western spread spectrum technology as using Western 3G formats
calls for payment of high patent fees to a large number of western patent
holders.
The launch of a
national commercial TD-SCDMA network in China is still postponed and the
technology is currently undergoing extensive field testing.
On January 7, 2009
China granted TD-SCDMA 3G licence to the national GSM carrier China Mobile.
Networks using other 3G standards (WCDMA and CDMA2000 EV/DO) have still not
been launched in China, as these are delayed until TD-SCDMA is ready. The two
standards, WCDMA and CDMA-2000, are assigned to China Unicom and China Telecom,
respectively.
TEST
UMTS or the Universal
Mobile Telecommunications System is a third generation wireless network
technology which allows speeds of up to 2Mbps.
UMTS is based on the
WCDMA technology, which is why these terms have become interchangeable.
Tethering
In the context of GSM
mobile phones, tethering describes the process of connecting a phone to a
computer so that the computer can access the internet via an EDGE/UMTS/HSDPA
network. In this way, the mobile phone acts as a modem for the computer.
That specific use of
the word "tethering" stems from the fact that to be used as a modem, the
mobile phone usually has to be connected to the computer via a USB data cable.
In recent years however the same thing has become possible without cables by
using a Bluetooth connection.
Thus, tethering has
turned into a generic term for using your mobile phone as a GSM modem for your
computer.
Some carriers require
that you sign up for special plans in order to use your phone for tethering,
while for others it's simply a matter of paying the data traffic used, much
like you pay for browsing on your mobile phone.
Text messaging
(texting)
Text messaging is a
service allowing text messages to be sent and received on a mobile phone. This
is also known as SMS (Short Message Service).
TFD (Thin Film Diode)
TFD is a kind of
Liquid crystal display (LCD) technology. It is an active-matrix technology
which means that a diode is situated next to each pixel making it possible for
the pixels to be turned on and off individually. This allows a quicker response
time and more contrast than passive-matrix technologies.
TFD takes the
excellent picture quality and the fast response of TFT displays and combines
them with the low power consumption and cost of the STN ones.
TFT (Thin Film
Transistor)
TFT is one of the
best Liquid Cristal Display technologies in terms of image quality and response
time. However, it also consumes more power and is more expensive.
TFT, like TFD, is an
active-matrix technology. This means a transistor is located next to each
pixel, allowing it to be turned on and off individually. This ensures faster
response time and greater contrast.
Theme
A theme is a motif
used in the user interface of a device. It usually consists of set of matching
elements to create the look of the menus, text boxes etc. Another popular term
used to describe this is 'skin'.
Themes or skins allow
the user of the device to customize the interface to reflect their own tastes.
To-Do list
The To-Do list is a
type of organizer application available on most mobile phones. It allows the
user to write down a list of personal tasks. These can also be prioritized and,
if needed, assigned a due date.
Touchscreen
Refers to a display
which responds to direct touch manipulation, either by finger, stylus, or both.
Trackball
A trackball is
pointing device allowing four-axis control. It consists of a small ball
embedded on the device surface, partially exposed so the user can move a finger
across it to rotate it in any direction. This allows fast scrolling in any
direction.
Transflash
Refer to microSD.
Transflective
A transflective -
also known as transreflective liquid crystal - display (LCD) is one that is
able to reflect most of the sunlight it is exposed to and automatically adjust
its backlighting depending on the amount of light shining on it. This strongly
reduces the need for manual light adjustment of the screen.
Transflective LCD
displays combine the benefits of transmissive and reflective ones, which makes
them equally readable in both bright sunlight and low-light conditions.
Tri-band
A Tri-band GSM phone
is one that supports three of the four major GSM frequency bands, allowing it
to work in most parts of the world. The two most common kinds of tri-band GSM
phones are the European type, which support the 900, 1800 and 1900 frequencies
and the American type, which cover the 850, 1800 and 1900 frequencies.
U
UI (User Interface)
User Interface is the
software front for interacting with the technical features of a mobile phone.
Although the term can
also be used for hardware input such as controls or keys, in the area of mobile
phones it's most frequently used to refer to the software-controlled elements
displayed on the screen that are used to interact with the device. That
includes icons in the menus, text boxes, etc.
User Interfaces that
are easier to use than others are referred to as more user-friendly.
UIQ
UIQ is a touchscreen
user interface for the Symbian OS. Owned and developed by Sony Ericsson and
Motorola, the user interface is now outdated and the software company UIQ
Technology filed for bankruptcy on 5 January 2009.
UMA
Unlicensed Mobile
Access enables access to cellular mobile voice and data services over
unlicensed spectrum technologies such as Bluetooth or Wi-Fi (802.11).
The idea behind this
technology is the following: when there is an accessible Wi-Fi hotspot near
you, the UMA-enabled device can connect to it and use the broadband connection
for making and accepting calls and sending and receiving data. It is very
similar to using wireless VoIP-telephony on your GSM mobile phone.
The UMA-enabled phone
is also be able to use regular GSM base stations as any normal mobile phone
can. The handset is able to seamlessly change connections between the licensed
cellular radio access network and the unlicensed IP network, even in the middle
of a call.
All you need to use
the new technology is a UMA-enabled device, an operator that supports UMA, and
an Internet broadband connection that you can access via Wi-Fi (WLAN).
The most important
difference from the widely known VoIP technology is that UMA is tightly linked
to the mobile radio network, which is used for routing, authentication and
billing. A call initiated using the Wi-Fi interface reaches the 2G core network
through the UMA Network and once the signal is transferred, it becomes
indistinguishable from the rest of the cellular traffic.
UMTS
UMTS or the Universal
Mobile Telecommunications System is a third generation wireless network
technology which allows speeds of up to 2Mbps.
UMTS is based on the
WCDMA technology, which is why these terms have become interchangeable.
Unlocked phone
A phone without a
carrier SIM lock.
Upload
Upload is also known
as uplink and means the one way connection from a device (phone, PDA, laptop
computer) to a network or server (mobile phone network, internet etc.).
UPnP (Universal Plug
and Play)
Universal Plug and
Play represents a couple of standards used to connect digital devices to both
wired and wireless networks. It's intended for use in PCs, TVs and some other
types of devices. In mobiles, UPnP is used to allow the sharing of media files
through Wi-Fi networks as well as to connect the device to a PC or a TV.
USB (Universal Serial
Bus)
USB is a standard for
a wired connection between two electronic devices, including a mobile phone and
a desktop computer. The connection is made by a cable that has a connector at
either end. One end, the one that plugs into the computer, is the same across
all USB cables while the one that plugs into the mobile device can be of
various types such as miniUSB, microUSB or a proprietary connector.
USB version 1.1
provides maximum speeds of up to 1.5 MB/s while the current version 2.0 is
about 40 times faster. The versions are backwards compatible and the speed is
limited by the slower device. Transferring data may require drivers to be installed
on the desktop computer but some phones offer "mass storage" mode
which means they appear as thumb drives to the computer and no special drivers
are needed.
In addition to their
data transferring application, USB cables also carry an electric charge that
can be used to power peripherals (such as USB mice or keyboards), and many
mobile phones can be charged through their USB port.
USIM
Refers to SIM card.
V
VGA (Video Graphics
Array)
One of the resolution
standards used for images, videos and displays. VGA means a resolution of 640
pixels x 480 pixels.
Video call
Video call is a 3G
network feature that allows two callers to talk to each other while at the same
time viewing live video form each other's phone. To make a video call, both
users should have 3G phones which support this feature and they both need to be
in range of a 3G network.
Video Codec
A video codec is the
part of the software that handles converting stored digital information back to
images and vice-versa. Different codecs have different capabilities, making
them suitable for different applications.
Regular feature
phones come with a fixed set of video codecs, while the capability of
smartphones to playback different codecs can usually be expanded by installing
third-party solutions.
The most popular
mobile codecs are H.263 used in 3GP videos, H.264 in MPEG4 videos, and DivX and
XviD for avi files.
Voice dialing
Voice dialing is a
feature most modern phones support. It allows the user to dial a number by a
voice command.
There are two ways
this is done. The first way is for the user to record the commands in advance
and then use them. This normally means that only the user who has recorded the
commands may apply them.
The other kind of
voice-dialing enabled phones use text recognition and no prerecording is
required. When someone issues a command these devices simply match it to the
nearest contact in the phone book.
This feature does not
depend on the speaker and usually performs better than the former method.
However, it is not commonly avaible, especially in older phones.
Voice mail
Voice mail is a
network feature offered by most networks. It is similar to an answering machine
and allows the caller to leave a voice message if the person called is
unavailable.
This feature means
that the person who received the message can listen to it whenever necessary.
Voice memo
Voice memos allow the
users of devices that support them to record a note that can be heard whenever
and wherever necessary. Some devices limit the duration of such memos whereas
other allow recording until they run out of memory.
VoIP (Voice over
Internet Protocol)
Voice over Internet
Protocol is a technology which allows the transmission of voice over data
networks. This makes normal phone calls over such networks possible.
VPN (Virtual Private
Network)
A set of
communication protocols that allows remote users to securely access a remote
network. An example of this technology is when you access your corporate
Intranet remotely from your mobile phone.
If your company has a
VPN server set up, you can enter the connection details on a supported device
and join the corporate Intranet with all user rights and privileges you would
have if you were physically there. At the same time, the connection remains
secure from unauthorized access.
W
WAP (Wireless
Application protocol)
WAP is an
international standard for applications that use wireless communication. Its
most common application is to enable access to the Internet from a mobile phone
or a PDA.
WAP sites are
websites written in or converted to WML (Wireless Markup Language) and accessed
via the WAP browser
WAP websites are now
considered outdated as most modern phones have web browsers with HTML support.
WCDMA(Wideband Code
Division Multiple Access)
Wideband CDMA is a
third-generation (3G) wireless standard which allows use of both voice and data
and offers data speeds of up to 384 Kbps.
The frequency bands
for WCDMA are as follows: Europe and Asia - 2100MHz, North America - 1900MHz
and 850MHz.
WCDMA is also called
UMTS and the two terms have become interchangeable.
Some parts of the
WCDMA are based on GSM technology and the networks are designed to integrate
the GSM networks at some levels.
Wi-Fi
Wi-Fi is a WLAN
(Wireless Local Area Network) technology. It provides short-range wireless
high-speed data connections between mobile data devices (such as laptops, PDAs
or phones) and nearby Wi-Fi access points (special hardware connected to a
wired network).
The most common
variant of Wi-Fi is 802.11g, which is capable of providing speeds of up to
54Mbps and is backwards compatible with 802.11b (providing up to 11Mbps).
There is currently a
new standard in the works called 802.11n (offering twice the speeds of 802.11b)
and there are already retail networking devices that support its draft
specifications.
Wi-Fi is much faster
than any data technologies operating through the cellular network like GPRS,
EDGE and even UMTS and HSDPA.
The range covered by
a Wi-Fi access point is from 30 to 100 meters indoors while outdoors a single
access point can cover about 650 meters.
Windows Mobile
Windows Mobile is one
of the major smartphone platforms and until recently the only touch-enabled
smartphone platform.
Windows Mobile
actually has two distinct editions - Windows Mobile Standard and Windows Mobile
Professional.
Software written for
either of the editions is not compatible with the other.
The main difference
between the editions is that Windows Mobile Professional supports touchscreen
and handwriting recognition.
Windows Mobile is a
product created by Microsoft but as the company does not produce any phones
itself, it licenses the platform to hardware manufacturers.
Before version 6 was
released the Windows Mobile Standard edition was known as Windows Mobile for
Smartphone, while the Professional edition was referred to as Windows Mobile
for PocketPC.
Wireless email
Email is everywhere
now and almost everyone has their own, password-protected email account.
Wireless email however is the ability to send and receive email over wireless
devices. As GPRS and 3G networks give users constant connectivity access to
their email, wireless email services are recently becoming increasingly
popular.
There are a wide
variety of handsets available today that support wireless push email services.
Push refers to
technologies that allow a central system, for example the mobile phone network,
to send - or push - information to an end-user without any action on their part
or on the part of the mobile device.
With push email,
emails are sent directly to the mobile device as soon as the email server
receives them rather than waiting for the user or email client to request the
email.
Today's push email
devices range from mid-priced mobile phones through to smartphones and
email-centric phones such as RIM's Blackberry.
As wireless email
solutions are widely integrated in corporate scenarios, support for the
existing corporate email services such MS Exchange ActiveSync, Blackberry
Connect or IBM Lotus as is getting more and more common in regular handsets.
Unfortunately, we
usually don't publish all the email services supported by the mobile phones in
our database. As this is the case, you should always seek further information
regarding support of specific services. When you see email support listed on
our specs pages, please bear in mind that it only guarantees basic POP and SMTP
protocols support and as manufacturers always like to point out, specifications
can always be changed without notice.
WLAN
Wireless Local-Area
Network is a way of providing a wireless high speed connection between data
devices or a data device and an access point over a short range. See Wi-Fi.
WMV (Windows Media
Video)
WMV stands for
Windows Media Video, a file format created for - and therefore most commonly
used to work with - Windows Media Player software which is featured on almost
all Windows platform-based devices.
Most third-party
video players also support the format or at least some of its versions.
X
Xenon flash
A xenon flash
produces an extremely intense full-spectrum white light for a very short
duration. It consists of a glass tube filled with xenon gas which emits a short
and very bright flash of white light when a high voltage is applied.
Usually, xenon
flashes are brighter than the LED flashes found in most camera phones. However
they cannot be used as video light and the condenser they use as a power source
needs some time to recharge after each shot.
The
presence of a xenon flash on a mobile phone doesn't necessarily mean a more
powerful flash performance. The power of the xenon flash is dependent on the
size of the condenser used to power it up.
0 - 9
2G
The name usually given to original GSM, CDMA, and TDMA networks. It uses
the spectrum more efficiently than analog (1G) systems, and offers digital
encryption of conversations. 2G networks introduced data services for mobiles
starting with SMS.
3G
Analog cellular
phones were the first generation while digital marked the second generation.
3G is loosely
defined, but generally includes high data speeds, always-on data access, and
greater voice capacity.
The high data speeds
are possibly the most prominent feature, and certainly the most hyped. They
enable such advanced features as live, streaming video.
There are several
different 3G technology standards. The most prevalent is UMTS, which is based
on WCDMA (the terms WCDMA and UMTS are often used interchangeably).
3GP video
3GP is a simplified
version of the MPEG-4 Part 14 (MP4) container format, designed to decrease
storage and bandwidth requirements in order to accommodate mobile phones. It
stores video streams as MPEG-4 Part 2 or H.263 or MPEG-4 Part 10 (AVC/H.264),
and audio streams as AMR-NB, AMR-WB, AMR-WB+, AAC-LC or HE-AAC.
3GP is designed for
effieciency to make it suitable for Streaming across mobile phone networks and
storing on mobile devices with very littel storage capacity. Video rarely
exceeds a QVGA resolution of 320 x 240 pixels but there are VGA or even D1
resolution exceptions. Audio is usually encoded as either MP3 or AAC-LC (Low
Complexity). Framerates for most mobile devices are Limited to 15fps.
There are two
different standards for this format:
·
3GPP (for
GSM-based Phones, may have filename extension .3gp)
·
3GPP2
(for CDMA-based Phones, may have filename extension .3g2)
Both are based on
MPEG-4 and H.263 video, and AAC or AMR audio.
When transferred to a
computer, 3GP movies can be viewed on Linux, Mac, and Windows platforms with
MPlayer and VLC media player. Programs such as Media Player Classic, Totem,
RealPlayer, QuickTime, and GOM Player can also be used. Some cell phones use
the .mp4 extension for 3GP video.
802.11
802.11 is a set of
IEEE standards for wireless local area networks (WLAN). The most common variant
is 802.11g, which is backwards compatible with the older B variant. 802.11g
devices are sometimes marked as 802.11b/g to indicate this compatibility. There
is a newer version - 802.11n - that provides higher maximum speeds and better
range.
The 802.11g
standard's typical speeds are rated up to 54 Mbps.
A
A-GPS (Assisted GPS)
Assisted GPS (A-GPS)
is used to speed up start-up times of GPS-based positioning systems. GPS may
have problems getting a lock when the signal is weak and in such a case A-GPS
would assist in getting a lock.
This, however, is
achieved by the use of an Assistance Server, so a data connection is required
and charges may apply for the data transfer.
A2DP (Advanced Audio
Distribution Profile)
A2DP is used for streaming
stereo music wirelessly to headphones or speakers over Bluetooth.
Unlike other
Bluetooth profiles (Headset and Handsfree), A2DP is one-way only and streams a
stereo signal.
AAC (Advanced Audio
Coding)
AAC is a file format
for storing digital audio. It's commonly used for storing music on the
Internet, PCs and portable music players and phones.
It is similar to MP3,
but it was designed to be its successor and offers better quality and smaller
file sizes. It also supports DRM, which enforces copyright.
AAC+ and AAC++ are
newer versions of the standard.
Accelerometer
The accelerometer is
a built-in electronic component that measures tilt and motion. It is also
capable of detecting rotation and motion gestures such as swinging or shaking.
The most common use
for it is to activate auto screen rotation on mobile devices when the user
changes their orientation from portrait to landscape or vice-versa.
Another modern
application for the accelerometer is to control the mobile device music player
with gestures (Sony Ericsson Shake control or Samsung Motion play
technologies).
Accelerometers are
also utilized for enriching the gaming controls (navigating by tilting the
device instead of by pressing keys).
Another popular
mobile phone feature based on an accelerometer is turn-to-mute. It allows user
to mute an incoming call, silence an alarm or pause the mobile music player
simply by turning the device face down.
Airplane mode
Please refer to Flight mode.
Alarm Clock
This is a feature
allowing a mobile phone to act like a common alarm clock but with more
flexibility.
Currently, all mobile
phones offer this functionality with varying feature sets. For example, most
devices allow you to set an unlimited number of alarms and set them to repeat
on a daily or weekly basis. Some even allow a customizable snooze period and
with the most advanced devices you can silence an alarm just by turning the
device face down.
Using a favorite FM
radio station as an alarm tone is also an option with some handsets.
Some phones require
the device to be on for the alarm to work while others do not.
Alphanumeric
A string of
characters containing both letters (A-Z) and numbers (0-9).
An alphanumeric text
entry field will accept both letters and numbers. An alphanumeric keypad is one
with both letters and numbers on the keys.
AMOLED display
(Active-matrix organic light-emitting diode)
AMOLED is an emerging
display technology used in portable devices like mobile phones. Active-matrix
OLED displays provide the same performance as their passive-matrix OLED
counterparts, but they consume significantly less power.
This advantage makes
active-matrix OLEDs well suited for portable electronics where battery power
consumption is critical.
Analog
A method of
transmitting information using energy waves. It doesn't have discrete levels
but is a continuously variable wave. Human voice for example is transferred by
directly converting the sound wave to electricity.
Analog cell phones
(known also as 1G) used this technology. However virtually all modern cell
phones use digital signals (2G or later).
Android
Android is a
Linux-based smartphone operating system and software platform created by
Google.
The Android platform
is supported by the Open Handset Alliance and is open source. Any manufacturer
can use Android on their phones and software written for the platform will run
on Android-based devices regardless of manufacturer.
Android competes with
Windows Mobile, S60, and other smartphone platforms.
Antenna
The physical device
used for sending/receiving radio waves. Older phones used external antennas
while most current phones use an internal antenna. The size and shape of the
antenna is designed according to the type of radio waves being used.
APN (Access Point
Name)
APN is the name (web
address) of an access point for GPRS/EDGE/UMTS data connection. Usually
wireless carriers provide the APN to their end users.
Audio jack
A common connector
for plugging in a standard pair of music headphones such as the ones found on
music players, computers and most other electronic devices with audio outputs.
It can support stereo
and/or microphone, depending on the number of separate connector rings on the
jack.
Some phones offer
only a 2.5 mm jack, which is a smaller variety of the same principle.
Headphones supplied
with mobile phones usually have a mic somewhere along the cable and a remote
button that allows for managing calls without using the phone.
Some manufacturers
opt for placing a 3.5mm audio jack on this remote control instead of directly
on the phone itself. The reason for this is that 3.5mm jacks take up quite a
lot of internal space; plus, in this way the user gets to keep the remote
control/mic functionality while using third-party headphones.
Auto-focus
Auto-focus is a
feature of digital cameras that allows them to focus correctly on a subject. It
enhances the quality of the photo over fixed-focus cameras and allows for
close-ups (or the even closer macro shots).
Phones use passive
auto-focus with contrast measurement. This means that the camera needs contrast
to focus and have problems focusing on a blank wall or in low light conditions.
Some phones can use
their camera LEDs as a focus assist light to help deal with the latter case.
AVRCP (Audio/Video
Remote Control Profile)
AVRC is a Bluetooth
profile that allows remote control of media playback on other devices.
Supported functions are play, pause, stop, next, and previous.
It is usually coupled
with A2DP so that, for example, wireless headphones use A2DP to stream the
music and AVRC to control playback.
B
Band
A specific range of
frequencies (for example those between 1850 MHz and 1995 MHz) are called a
band.
Bandwidth
Bandwidth is used to
measure the data throughput of a channel or connection. It's the amount of data
that can be sent over a connection in a given amount of time without
distortion. It should not be confused with band.
Bar
The bar form factor
is the most common and simple form factor for a mobile phone. The body of a bar
phone is one, single block and has no moving parts (aside from the buttons).
"Locking" the keyboard is done to prevent accidental key presses when
the phone is carried in a pocket, purse, etc.
Base Station
A fixed station that
uses radio waves to communicate with mobile devices. It serves as the link
between the user's device and the carrier's network.
Base stations range
in size and area of coverage. Some may cover a radius of several kilometers
while others cover only a few city blocks. Most stations transmit in all
directions but there are also directional antennas aimed at a specific
direction.
Usually base stations
are owned by a single carrier but may offer roaming coverage for other
networks.
Bit
A binary digit. The
values of a bit are either "0" or "1". Eight bits form a
byte.
Bluetooth
Bluetooth is a
wireless protocol for exchanging data over short distances from fixed and
mobile devices, creating personal area networks.
There are two
important parameters of Bluetooth devices - class and supported profiles.
"Class"
signifies the distance at which a Bluetooth connection is possible. Most mobile
devices are Class 2, which means they have a range of up to 10 m. Class 1
devices are rare and have a range of up to 100 feet.
A "profile"
is a type of Bluetooth connection. The most common are the Headset (HSP) and
Handsfree (HFP) profiles that enable the device to connect to a wireless
headset or handsfree.
Some other profiles
are OBEX (OBject EXchange) which allows transfer of files, contacts and events;
A2DP, which adds support for streaming of stereo sound and AVRC, which allows
remote control of playback.
bps (Bits per Second)
A measure of data
transmission speeds, the amount of bits transferred in a single second. Typically,
speeds are measured in kbps (1000 bits per second).
Note: kBps (with a
capital B) denotes bytes per second.
Brand
Not necessarily the
same thing as a manufacturer, as most carriers do not fabricate their own
devices, but rather acquire them from manufacturers and sell them under their
own brand. This is called re-branding.
Broadband
In data
communications, a "broadband connection" is a connection with a high
speed of data transfer (greater than 56 kbps). Generally, it is fast enough to
support streaming video.
Browser
A piece of software
that allows the user to access Internet sites.
Most current handsets
are equipped with browsers capable of viewing common websites (those intended
for a desktop browser).
Web browsers on
budget cellphones may be capable of viewing only websites specially made for
mobile devices. The most advanced devices currently have web browsers with full
Flash support that allows them to play even embedded Flash video (such as the
videos from YouTube).
Byte
A string of 8 bits.
Typically, one byte
equals one character of text but in some cases (especially with non-Latin
alphabets), two or more bytes are used. Because of this, an SMS written in
Cyrillic or Chinese alphabets has shorter maximum length than one written in
the Latin alphabet.
C
Calculator
The basic functions
(addition, subtraction, multiplication, division) are included in all
calculators but some offer more advanced options such as square root or
trigonomic functions.
Some calculators have
the option to convert currency and can calculate mortgage payments.
Calendar
Calendars (also known
as PIM - Personal Information Manager) allow you to store information about
events such as meetings or reminders (e.g. to remind you of someone's
birthday). Usually an alarm can be set to sound an alert.
Some devices offer
the ability to synchronize the calendar with the one on your computer or your
online clendar/task manager.
Call alerts
The mobile phone can
alert you of events such as an incoming call or an incoming message in a number
of ways. The two most popular ones are vibration and ringing.
While vibration is
pretty much self-explanatory, the ringing alerts can be of several types
depending on the mobile phone.
In the past mobile
phones used to allow only monophonic tones to be set as ringing alerts. With
the advancement of technology, polyphonic ringtones also became supported.
Later on as mobile
phones further evolved, they started using MP3 tones for various alert purposes. As more (presumably
superior) audio formats became available (such as AAC), they were also added to the mobile phones' alert
system.
Recently, mobile
phones have even started to use short video clips as call alerts (not to be
confused withvideo calls).
No matter what kind
of ringing tones the mobile phone uses, users have always enjoyed customizing their ringtones by expanding the preset ones supplied by the
manufacturer.
Calling Plan
Services offered by
the wireless service provider as a package. These usually include activation,
monthly charges, per-minute voice call charges, roaming terms, voicemail, data,
and international roaming.
Camera
Some phones feature a
camera that gives them the ability to work as a digital camera. Often (though
not always) the camera is also able to shoot video.
The most important
characteristics of a camera are the resolution (measured in megapixels), lens
focus type (either fixed or automatic) and the presence of a flash. The flash
could be either LED (single or even double) or xenon.
The number of
megapixels is not always a good measurement of the quality of the photos, but
if you plan to print pictures, you would generally get higher quality ones out
of higher megapixel cameras.
Auto focus lens are
not a guarantee of better image quality, but fixed focus cameras are usually
inferior. Most importantly, only auto focus cameras can allow shooting of
really close objects - i.e. macro shooting.
Some phones offer
optical zoom but those are rare. Most use digital zoom, which degrades the
quality of the photo.
Cameras that can work
in "video mode" are characterized by the maximum resolution and
framerate (frames per second or fps) of the recorded video.
Capacitive
Touchscreen
Capacitive touch
sensors are used either as buttons or on touchscreens. They work by sensing the
electrical properties of the human body instead of pressure and generally they
don't work with a stylus so they don't allow handwriting recognition. However,
capacitive touchscreens feel more sensitive than their resistive counterparts.
Capacitive touch
screens are also considered more durable than resistive touch screens.
Car Kit
In some countries, it
is prohibited to use a mobile phone while driving so special accessories are
sold which let you make a call without holding the phone in your hand.
Such accessories are
sold as kits that may include a holder for the phone, a battery charger,
connections to an external speaker and microphone for better audio quality, an
external antenna for better reception and a junction box with data port for
optional fax/modem connections.
Carrier
Carriers (sometimes
service providers, operators) are the companies that sell the use of a wireless
network. Usually they own the network though some (called MVNO) do not.
The network consists
of base stations (cell towers) and the infrastructure linking them.
The service allows
the user to access the network and they are billed by the minute (for calls) or
by kilobytes (for data transfers). Such services are sold as packages known as
"calling plans".
CDMA (Code-Division
Multiple Access)
CDMA is a digital
technology for transmitting data. It is a general technology utilized through
various standards.
CDMA has no limit on
capacity but the base station will only connect users upon determining that the
call quality would fall bellow a predetermined limit.
The term is often
used to refer to one specific family of technologies - IS-95 (often referred to
cdmaOne) and CDMA2000. Networks using this technology operate in the 800 and
1900 MHz frequency bands and are primarily used in the Americas and Asia.
CDMA2000
A 3G wireless technology, evolved from cdmaOne. Improvements over the old
standard include faster data rates, always-on data service, and improved voice
network capacity.
There are three types of CMDA2000:
·
1xRTT doubles the
capacity of cdmaOne and supports up to 144 kbps data speeds
·
1xEV-DO supports
data rates up to 2.4 Mbps but needs to be deployed in a separate spectrum. This
standard doesn't support voice calls and needs to be combined with 1xRTT.
·
1xEV-DV supports
data rates of around 3-5 Mbps and voice capabilities
Cell
Wireless networks are
comprised of many overlapping cells (the area covered by a base station).
"Cell" can
also refer to one or more connected base stations.
Chipset
Mobile phones run on
so-called embedded chipsets, which are designed to perform one or a few
dedicated functions, often with real-time computing constraints. They are
embedded as part of the complete device including hardware and mechanical
parts.
The ever popular
smartphones are equipped with more advanced embedded chipsets that can do many
different tasks depending on their programming.
Thus their CPU
(Central Processing Unit) performance is vital for the daily user experience
and people tend to use the clock rate of the main CPU that's in the heart of
the chipset to compare the performance of competing end products.
As we already pointed
out, the clock rate of a processor is only useful for providing performance
comparisons between computer chips in the same processor family and generation.
Also, as mobile gaming is increasingly gaining popularity, users have
become more aware of the various types of GPU (Graphics Processing Unit) chips
that come as part of the mobile chipsets and sometimes even consider their performance
when making buying decisions.
cHTML (Compact
HyperText Markup Language)
cHTML is a simplified
version of HTML with features such as the accesskey attribute for
numpad-optimized web navigation, phone number shortcuts for links, and emoji
pictorial characters.
cHTML is used
exclusively for iMode, a service that is offered only in Japan and several
European countries.
Most phones use the older WML format or the newer XHTML Mobile Profile.
CIF (Common
Intermediate Format)
A standard resolution
- 352 x 288 pixels - used by some digital cameras for either images or video.
Variations include
QCIF (Quarter CIF) - 176 x 144 pixels - and SQCIF (Sub Quarter CIF) - 128 x 96.
Clamshell
The phone consists of
two halves connected with a hinge in the middle. The hinge allows the phone to
be folded close (much like a sea clamshell, hence the name). When the phone is
closed, the keyboard is protected from accidental key presses.
The top half usually
hosts a small external display and a large internal main display, while the
bottom half incorporates the keyboard.
The camera (if
present) can be on either half.
CMOS (Complementary
metal-oxidesemiconductor)
CMOS is one of two
major types of image sensor technologies used in digital cameras (the other
being CCD). The image sensor of a digital camera serves as a digital substitute
for film in ordinary cameras.
The camera sensor
captures light, converts it to electric charge and processes it into electronic
signals.
Generally, CMOS
sensors are smaller, cheaper and more energy efficient and currently deliver
the same image quality as CCD sensors.
Color depth
This refers to the
number of different colors a display is able to produce. A higher number
results in a broader range of distinct colors. It is commonly accepted that the
human eye can discern up to 10 million colors.
Concatenated SMS
Typically, an SMS is
160 characters in length (using Latin characters) but a concatenated SMS has a
longer maximum length. The message is composed as a single message and the
phone splits it into several shorter messages that are reassembled by the
receiving phone. Maximum length varies between 300 and 1,000 characters
depending on the device.
CPU (Central
Processing Unit)
CPU (Central
Processing Unit) - otherwise known as a processor - is an electronic circuit
that can execute computer programs. Both the miniaturization and
standardization of CPUs have increased their presence far beyond the limited
application of dedicated computing machines. Modern microprocessors appear in
everything from automobiles to mobile phones.
The clock rate is one
of the main characteristics of the CPU when performance is concerned. Clock
rate is the fundamental rate in cycles per second (measured in hertz,
kilohertz, megahertz or gigahertz) for the frequency of the clock in any
synchronous circuit. A single clock cycle (typically shorter than a nanosecond
in modern non-embedded microprocessors) toggles between a logical zero and a
logical one state.
With any particular
CPU, replacing the crystal with another crystal that oscillates with twice the
frequency will generally make the CPU run with twice the performance. It will
also make the CPU produce roughly twice the amount of waste heat.
Engineers are working
hard to push the boundaries of the current architectures and are constantly
searching for new ways to design CPUs that tick a little quicker or use
slightly less energy per clock. This produces new cooler CPUs that can run at
higher clock rates.
Scientists also
continue to search for new designs that allow CPUs to run at the same or at a
lower clock rate as older CPUs, but which get more instructions completed per
clock cycle.
The clock rate of a
processor is only useful for providing comparisons between computer chips in
the same processor family and generation.
Clock rates can be
very misleading since the amount of work different computer chips can do in one
cycle varies. Clock rates should not be used when comparing different computers
or different processor families. Rather, some kind of software benchmarks
should be used.
Smartphones are
equipped with more advanced embedded chipsets that can do many different tasks
depending on their programming.
The performance of
the CPU that's at the core of the chipset is vital for the daily user
experience and the general computing performance of the smartphone. People tend
to use the clock rate of the main CPU to compare the performance of competing
end products. But as we already pointed out, the clock rate of a processor is
only useful for providing performance comparisons between computer chips in the
same processor family and generation. For all other purposes, it's best to use
software benchmarks for determining comparative performance.
Crosstalk
A phenomenon by which
a signal transmitted on one circuit or channel creates an undesired effect on
another circuit. Generally rare in modern digital wireless phone systems but
not entirely eliminated.
Stereo crosstalk for
example is one of the parameters of audio quality we test when reviewing mobile
phones. The crosstalk measurement is made to determine the amount of signal
leaking across from one channel to another or - in purely non-technical terms -
it measures how good the stereo is.
CSTN (Color Super
Twisted Nematic)
STN is a type of LCD
display technology. STN is black and white while CSTN is the color version.
(C)STN displays are used on lower end devices.
Typically an STN
display has worse image quality and response times than a TFT LCD, but is
cheaper and more energy efficient.
CTIA
CTIA is the
International Association for the Wireless Telecommunication Industry, an
international organization dedicated to expanding the wireless frontier.
It's basically an
international industry trade group representing all wireless communication
sectors.
Custom ringtones
Phones come preloaded
with a selection of ringtones, yet some phones also allow the user to load a
new ringtone. This could be done by writing the notes in a built-in composer,
or by downloading the ringtone via a special SMS/MMS or from the internet.
An easy way to
transfer custom ringtones to your mobile phone is via a USB data cable,
Bluetooth or a memory card reader.
When you want to use
custom ringtones, you should check the phone supported file formats beforehand.
D
D-Pad (Direction Pad)
A circular- or
square-shaped pad that provides navigation keys for the four directions: up,
down, left and right. These are the equivalent of the "arrow keys" on
a computer keyboard and are used for navigating the user interface.
An enhanced version
of the D-pad called an 8-way D-pad allows for scrolling diagonally as well.
Some D-Pads have a
center button usually called "select" or "OK". It is used
to select a highlighted item in the user interface.
Digital Zoom
Zoom is a feature common among cameras and is used to make the subject
appear closer. Cameras on mobile phones often have a zoom feature as well but
most often it is digital zoom.
Digital zoom is implemented in one of two ways:
·
Cropping - the
software crops the image so that the subject would appear bigger on the screen
of the phone but the resulting image is smaller than the maximum resolution of the
camera. The photo of the subject does not have any more detail than a
non-cropped photo would.
·
Stretching - this
is similar to cropping but instead it stretches the cropped photo to the
selected resolution. Since the stretching is done by an algorithm that uses
just the information from the cropped photo no additional detail is visible.
Display type
There are lot of
display types used in mobile phones. They can be either color or monochrome.
Monochrome displays on the other hand can be alphanumeric or graphic.
Alphanumeric displays can show only symbols with a constant size, while graphic
displays can show fonts of different sizes and animations.
The color displays
usually are CSTN, TFT, TFD or OLED with a predominant use of TFT displays in
current mobile lineups. There are also two types of touchscreen displays -
capacitive and resistive, which are both based on TFT technology.
CAPACITIVE
touchscreens work by sensing the electrical properties of the human body, while
RESISTIVE ones operate by sensing direct pressure applied by the user.
The RESISTIVE type
can be activated by pressing not only with human skin but also with a stylus
and thus allow handwriting recognition input.
DLNA (Digital Living
Network Alliance)
DLNA refers to both
an organization and the technology they created.
The DLNA standard is
used for sharing music, photos and video over an existing home network.
For example, by using
DLNA you could stream video from your phone to a compatible TV-set using a
Wi-Fi network.
DNSe (Digital Natural
Sound engine)
DNSe or the Digital
Natural Sound engine is a DSP audio enhancement technology developed by Samsung
in 2003 and further on implemented throughout many of their product lineups -
from TVs and DVD players to portable music players and lately - mobile phones.
As Samsung puts it,
the aim of DNSe is to restore the best sonic experience to the end user.
Purportedly, the sound engine yields higher quality sound with more natural
effects than conventional methods by reproducing the 'genuine' stereo sound
intended by the music content creators. It achieves this by actively working on
overcoming the limitations of earphones and less-than-ideal speakers to offer
realistic stereo and deep bass sounds.
In addition, Samsung
have created ideal listening presets that further compensate for the native
restrictions of portable multimedia players. The system uses several basic
processing methods aiming at various imperfections of the sound produced by
portable players.
Concert
Hall recreates
life-like reflected and reverberated sounds to simulate the experience of a
live performance in a concert hall. 3D
speaker separates and
combines sound to create realistic sense of both space and distance through
small-sized speakers. Clarity enhancement tries to electronically
restore the distorted harmonics of the digitally compressed music. Bass Extension applies an electronic harmony logic to
correctly play hi-fidelity sounds at an ultra-low frequency through earphones
or small-sized speakers. And finally, Street
mode selectively adjusts
volume so that the tiny notes are audible even in the loud street environment
without the uncomfortable boosting of the general volume level.
The DNSe sound
enhancement system combines those sound enhancements with different equalizer
settings to create various user-centric presets to suit the most common
listening scenarios. If that is not enough, the system alows creating custom
presets as well.
Samsung DNSe is not
to be confused with the Samsung proprietary DNIe (Digital Natural Image engine)
technology. DNIe is used in Samsung plasma and high definition television sets
(HDTV). Purportedly, DNIe offers better detail than conventional televisions by
using four proprietary processes that optimize and enhance image quality: a Motion
Optimizer, a Contrast Enhancer, a Detail Enhancer, and a Color Optimizer.
Downlink
The one-way
connection from a server (such as the cellular network) to the user device
(such as a mobile phone).
Mobile phones
typically utilize a two-way connection consisting of downlink and uplink (the
connection from the user device to the server) which is asymmetrical - that is,
the downlink is much faster than the uplink.
DRM (Digital Rights
Management)
Manages the use of
copyright-protected data such as music, graphics, videos etc.
For example, DRM can
prohibit you sending a downloaded media file to other media such as CD, DVD, or
even PC.
Dual-band
Mobile phone networks
work using signals on specific frequency bands and a phone must support those
bands in order to work with the network. Dual-band refers to the phones ability
to work with two different bands. It is important to specify which bands
exactly.
Networks in different
geographical locations work on different bands - GSM networks in the Americas
use the 850 MHz and 1900 MHz bands while networks in Europe, Brazil, Asia and
Africa use the 900/1800 MHz bands.
For example an
900/1800 dual-band phone won't work in the US and an 850/1900 phone won't work
in Europe. A 900/1900 phone should work on at least one network in most
countries around the world.
Dual-Mode
A dual-mode phone is
a phone capable of sending/receiving data in two different ways. For example, a
dual-mode phone could support both GSM and CDMA.
Dual-SIM
This specifies
whether a device is capable of supporting two SIM cards. The two major types of
dual-SIM phones are active and standby. Dual-SIM Standby (DSS) requires the
user to specify which of the two SIMs is able to make and receive calls, while
Dual-SIM Active (DSA) enables both cards to receive calls at the same time.
This latter feature usually requires an additional transceiver for the
secondary SIM card, and as such consumes more battery life. More recent models
feature Dual SIM Dual Standby (DSDS) technology which enables them to have two
active SIMs with only one transceiver.
DVB-H (Digital Video
Broadcasting - Handheld)
A European standard
specifically for the broadcasting of television content to hand-held devices
based on DVB-T.
As of 2007, live
trial runs of DVB-H have started in many European countries, as well as other
countries around the world.
Dynamic Memory
A way or organizing
different types of data in the phone's memory. Also referred to as Shared
memory.
Dynamic memory means
that all types of data are stored in the same memory (there is no separate
memory for photos, ringtones etc.).
An advantage of
dynamic memory over partitioned memory is that it is more flexible - with
partitioned memory, you can fill up the photo memory for example and you won't
be able to take any more photos even if other types of memory are free.
E
EDGE (Enhanced Data
for Global Evolution)
EDGE (also known as
Enhanced GPRS or EGPRS) is a data system used on top of GSM networks. It
provides nearly three times faster speeds than the outdated GPRS system. The
theoretical maximum speed is 473 kbps for 8 timeslots but it is typically
limited to 135 kbps in order to conserve spectrum resources. Both phone and
network must support EDGE, otherwise the phone will revert automatically to
GPRS.
EDGE meets the
requirements for a 3G network but is usually classified as 2.75G.
EDR (Enhanced Data
Rate)
An optional part of
the Bluetooth specification that provides a faster data rate (speed) and
possibly improved battery life. Not all Bluetooth devices support EDR and will
depend on the Bluetooth version and supported profiles. Both devices need to
support EDR, in which case EDR is used automatically.
EGPRS
A synonym for EDGE.
EGSM (Extended GSM)
EGSM extends the
frequency bands of GSM 900 giving it added network capacity.
Most new phones
listed as GSM 900 also support EGSM.
Email client
Some phones provide a
full email client that can connect to a public or private email server via a
wireless data connection(cellular or Wi-Fi).
There are different
protocols used by the servers and some may not be supported by the phone's
email client.
EMS (Enhanced Message
Service)
EMS or the Enhanced
Messaging Service is an extension of SMS, which allowed mobile phone to send
and receive messages that have special text formatting (such as bold or
italic), animations, graphics, sound effects and ringtones.
EMS is an
intermediate technology between SMS and the rich multimedia messages otherwise
known as MMS.
EV-DO
A 3G technology
add-on for CDMA networks that allows for theoretical download speeds as fast as
2.4 Mbps, though actual rates tend to be far slower.
There are two major
versions: Release 0 and Revision A.
Release 0, the
original release, is widely deployed. It offers data rates of 2.4 Mbps, with
real-life speeds averaging 300-600 Kbps.
Revision A introduces
enhancements that allow features such as VoIP and video calling. Although EV-DO
does not support voice calls natively a future upgrade may enable VoIP.
EV-DV
EV-DV is part of the
same family of CDMA connectivity as EV-DO. Unlike EV-DO, however, EV-DV also
supports voice calls. EV-DV is essentially a combination of EV-DO and 1xRTT.
Development of the
technology stalled before launch and was superseded by EV-DO plus VoIP.
Exchangeable covers
Some phones have been
designed to let the user remove the covers (front and back) and replace them
with others, changing the color, pattern or even the styling of the phone.
Some examples include
Nokia Xpress-On covers and Sony Ericsson Style-Up covers.
External Antenna Jack
A connector that
allows an external antenna to be connected to the phone to improve reception
indoors or in a car. The jack is usually hidden in some way, most commonly with
a rubber plug.
Note: not all antenna
jacks are the same
External Display
Since the display of
clamshells is hidden when the phone is closed, many phones include a secondary
display on the outside.
This display is of
lower quality than the main display (lower resolution, may be monochrome,
etc.). It is used to display various notifications such as the time, Caller-ID,
missed calls.
In many camera
phones, the external display can act as a viewfinder to help frame
self-portrait photos.
F
FCC (Federal
Communications Commission)
Known also as the
FCC, the Federal Communications Commission is a US government agency controlled
by Congress. The FCC monitors and regulates interstate and international
communications by radio, television, satellite and cable.
The FCC also
certifies all mobile phones intended for use in the US, insuring compliance
with spectrum allocations, technical standards, and safe radiation levels.
Feature Phone
A mobile phone that
is not smartphone. It has operating system firmware, but third party software
support is limited to only Java or BREW applications.
Recently feature
phones have begun to offer similar features to those of smartphones, so the
main difference between the two groups now is the third-party software support.
Femtocell
A small cellular base
station, typically designed for use in residential or small business
environments. The benefits of these portable base stations are similar to the
ones of using, for example, regular Wi-Fi access points. They allow the
expansion of the corporate telephony and intranet network so it can be used by
regular mobile phones.
Femtocells are the
size of a regular broadband cable router. The small size offers a small area of
coverage – in most cases a large-spaced room or two or three separate small
rooms.
The femtocell can be
easily installed by end users, while cellular towers are only installed by the
carrier.
Firmware
Fixed software
programs that internally control various electronic devices or individual
hardware parts of these devices (such as mobile phones). They involved very
basic low-level operations of the device, without which the device would be
completely non-functional.
More simple firmwares
are usually stored on ROM or OTP/PROM, while more complex firmwares occupy
flash memory to allow for updates. Common reasons for updating firmware include
fixing bugs or adding features to the device.
Doing so usually
involves loading a binary image file provided by the manufacturer into the
device, according to a specific procedure. More often than not this is meant to
be done by the end user.
Fixed-focus
The camera focus is
set to a specific distance by the manufacturer and can’t be adjusted.
Fixed focus digital
cameras limit the photo quality and the minimum shooting distance (no close-ups
are possible). The fixed focus technology uses a very small lens with a tiny
aperture, thus making all visible subjects in focus no matter their distance
from the camera.
Basic mobile phones
cameras are usually of the fixed-focus type.
Flash Memory
Flash memory is
non-volatile computer memory that can be electrically erased and reprogrammed.
Non-volatile means that no power is needed to maintain the information stored
on the chip.
It is a technology
that is primarily used in memory cards and USB flash drives as solid state
storage and its main purpose is an inexpensive way of storing or transferring
data between computers and other digital products. It’s used as primary storage
memory on various portable devices due to its low cost, compact size, great
physical endurance and low power consumption.
The most popular
types of flash memory are NAND and NOR.
Flight mode
Known also as
Airplane mode, this mode disables all radio parts of a mobile phone but leaves
other functions available. These include music player, organizer and everything
that doesn't require the radio transmitters.
This mode is required
because most airlines forbid the use of wireless devices during flight. Some
airlines do not allow the use of such devices even in Airplane mode.
There is an industry
standard icon to signify that airplane mode is on but not all phones use it.
This mode is required
for several reasons. Preventing interference with the airplane equipment is the
best known one but another reason is that cell towers cannot handle phones
moving at high altitudes and speeds.
Flip-down phone
It’s a mobile phone
form factor that’s a cross-over between the Bar and Clamshell form factors.
In this case the
device is mainly a bar, but a thin "flip" part covers the keypad
and/or display when not in use.
FM Radio
The built-in FM radio tuner is now considered a basic feature. It allows
the user to listen to most of the live-broadcasted FM radio stations. Almost
all phones with FM radio tuner require a wired headset to be connected to the
unit as it’s used as an antenna.
Most FM radio tuners can receive basic radio station info over RDS. The use
of FM radio does not interfere with the network carrier and it’s free.
Nokia enhance their FM radio interfaces with the Visual Radio enhancement
that adds visuals and text as an additional info layer to normal radio
broadcasts.
A presentation of graphics and text, synchronized to the audio programming,
gets downloaded to the phone over a data connection; the FM transmission chain
is unaffected by the addition of Visual Radio.
Here's the type of content that Visual Radio can offer:
·
Information on the
song and artist currently playing on air
·
View images related
to presenters or news stories
·
A weather map
during the weather broadcast
·
News, weather and
traffic alerts while songs are playing
·
Listen in to a
talk show and see what has been discussed so far
·
Join in audience
votes, Big Brother style
·
Participate in on-air competitions
You can only use the Visual Radio enhancement via a cellular data
connection, as using it over Wi-Fi is not an option.
FM Transmitter
An FM transmitter
allows a phone to broadcast music stored in its memory on FM frequencies, so
that it can be tuned into a nearby FM receiver such as a a car radio.
FM transmitters are
not a common feature on mobile phones, but such modern models do exist. The
mobiles transmit at low power so interference with regular FM radio stations is
highly likely – especially in dense urban environments where most of the FM
spectrum is already populated by live radio broadcasts.
Some embedded FM
transmitters allow for transmitting the music details over RDS.
Form factor
The general look, or
size and shape, of a mobile device.
All mobile phones are
similar at the physical style level. Most devices fall into one of the
following categories: Bar, Clamshell, Flip down, Slide or Swivel. Mobile
manufacturers come up with new designs, but the base they use is normally one
of these form factors.
FOTA (Firmware
Over-The-Air)
This is a special
feature supported by some phones, where users can update their handset firmware
over the carrier network. It removes the need of special cables, computers or
third-party programs.
FPS (Frames Per
Second)
This measurement is
the video resolution measured in time. 24-30 fps is the normal level for good
picture quality. A video with lower framerates appear as “choppy” on screen and
fail to capture fast moving objects properly.
Frame Error Rate
Ratio of data
received with errors to total data received. Used to determine the quality of a
signal connection. If the FER is too high (too many errors), the connection may
be dropped.
Frequency
Measured in hertz
(cycles per second), rate of repetition of changes / waves.
The term frequency is also used for range
(band) on the radio frequency spectrum, such as 800 MHz, 900 MHz or 1900 MHz.
FTP (File Transfer
Protocol)
A standard for
transferring files over the Internet. Not commonly used on phones, although
there is FTP software available for most smartphone platforms.
G
GB (Gigabyte)
1GB is equal to
approximately 1 billion bytes or exactly 1024 MB.
Gbps (Gigabits per
second)
1 Gbps = 1024 Mbps.
Gbps measures data transmission over a carrier.
Geo-tag
Geo-tagging is a
function, where GPS-enabled devices can insert metadata with geographical
information (coordinates) into a file such as photo, associating it with the
geographic location it was taken at.
Some new cameraphones
support automatic geo-tagging of any pictures taken.
Geo-tags can be read
by any device or desktop computer software which reads geo-tagging metadata,
such as image editors and online image galleries.
GPRS
General Packet Radio
Service is a packet-switching technology that enables data transfers through
cellular networks. It is used for mobile internet, MMS and other data
communications. In theory the speed limit of GPRS is 115 kbps, but in most
networks it is around 35 kbps. Informally, GPRS is also called 2.5G.
GPS (Global
Positioning System)
Global Positioning
System was developed by the United States' Department of Defense. It uses
between 24 and 32 Medium Earth Orbit satellites that transmit precise microwave
signals. This enables GPS receivers to determine their current location, time
and velocity. The GPS satellites are maintained by the United States Air Force.
GPS is often used by
civilians as a navigation system. On the ground, any GPS receiver contains a
computer that "triangulates" its own position by getting bearings
from at least three satellites. The result is provided in the form of a
geographic position - longitude and latitude - to, for most receivers, within
an accuracy of 10 to 100 meters. Software applications can then use those
coordinates to provide driving or walking instructions.
Getting a lock on by
the GPS receivers on the ground usually takes some time especially where the
receiver is in a moving vehicle or in dense urban areas. The initial time
needed for a GPS lock is usually dependent on how the GPS receiver starts.
There are three types of start - hot, warm and cold.
The hot start is when the GPS device remembers its
last calculated position and the satellites in view, the almanac used
(information about all the satellites in the constellation), the UTC Time and
makes an attempt to lock onto the same satellites and calculate a new position
based upon the previous information. This is the quickest GPS lock but it only
works if you are generally in the same location as you were when the GPS was
last turned off.
The warm start is when the GPS device remembers its
last calculated position, almanac used, and UTC Time, but not which satellites
were in view. It then performs a reset and attempts to obtain the satellite
signals and calculates a new position.
The receiver has a
general idea of which satellites to look for because it knows its last position
and the almanac data helps identify which satellites are visible in the sky.
This takes longer than a hot start but not as long as a cold start.
And finally – the cold start is when the GPS device dumps all the
information, attempts to locate satellites and then calculates a GPS lock. This
takes the longest because there is no known information.
The GPS receiver has
to attempt to lock onto a satellite signal from any available satellites,
basically like polling, which takes a lot longer than knowing which satellites
to look for. This GPS lock takes the longest.
In an attempt to
improve lock times, cellphone manufacturers and operators have introduced the
Assisted GPS technology, which downloads the current ephemeris for a few days
ahead via the wireless networks and helps triangulate the general user’s
position with the cell towers thus allowing the GPS receiver to get a faster
lock at the expense of several (kilo)bytes.
gpsONE
gpsOne is the brand
name for a mobile GPS chipset manufactured by Qualcomm that allows mobile
phones to lock a user’s position faster by using a technology referred to as
A-GPS or Assisted-GPS.
gpsOneXTRA Assistance
technology
Qualcomm's new
gpsOneXTRA Assistance technology provides enhanced operation by enabling a user
to download a small assistance data file through a brief Internet access
session.
Network operators who
have not yet deployed A-GPS systems can provide their subscribers with enhanced
GPS performance on mobile handsets by using Qualcomm's gpsOneXTRA Assistance
technology.
GPU (Graphics
Processing Unit)
The GPU (Graphics
Processing Unit) is a specialized circuit designed to accelerate the image
output in a frame buffer intended for output to a display.
GPUs are very
efficient at manipulating computer graphics and are generally more effective
than general-purpose CPUs for algorithms where processing of large blocks of
data is done in parallel.
Modern smartphones
are equipped with advanced embedded chipsets that can do many different tasks
depending on their programming. GPUs are an essential part of those chipsets
and as mobile games are pushing the boundaries of their capabilities, the GPU
performance is becoming increasingly important.
H
H.263
A video codec
standard originally designed as a low-bitrate compressed format for
videoconferencing. It has been widely adopted as the standard for video
streaming over mobile networks.
Standard image sizes
specified by H.263 include SQCIF (128 x 96 pixels), QCIF (176 x 144), and CIF
(352 x 288) resolutions.
H.263 handles only
the visual part of a video stream, the audio is encoded using audio encoders
such as AMR.
Half-QWERTY keyboard
layout
A keyboard layout
similar to QWERTY but having two letters per key. The basic arrangement is the
same, however the keyboard is narrower which makes it suitable for use with one
hand and it fits more easily in the lower part of a bar-shaped device.
Predictive text is
almost always used auto-suggest words allowing users to press a button only
once.
Handwriting
recognition
The ability of a
device or software program to analyze the shape of cursive or printed
handwriting drawn on a touchscreen and then translate it into letters, words,
numbers, and punctuation marks.
Most devices that
have touchscreens have built-in handwriting recognition capability. Input is
best done using a stylus.
It should be noted
that only devices using resistive type of touchscreen readily allows for input
with various objects. The capacitive touchscreen devices can accept only human
finger input.
Haptics
A category of
technology that provides physical feedback when the user interacts with virtual
things. This could be "pressing" a button on a touch screen or
"feeling" the rough edge of the road in a racing game.
The feedback is
implemented as vibration.
Hot Spot
An area where users
can access Wi-Fi services to access the Internet if they have the appropriate
device. Hot spots vary in area of coverage. They are usually public and many
charge users by the day or month. However, some are free - for example
privately owned in restaurants or cafes or public in universities and schools.
Hot Swap
Inserting or removing
an external peripheral device (such as flash memory or hard drive) from a host
(a mobile phone or desktop computer) while the host is still operating.
"Hot
swappable" refers to a component's ability to be operated in such way.
In mobile phones,
this usually refers to the ability to insert or remove the memory card without
switching off the device.
HSCSD (High-Speed
Circuit Switched Data)
A system for data
calls on GSM networks that came before packet based systems such as GPRS and
EDGE.
HSCSD is the
"high-speed" variant of CSD (maximum speed of 9.6 kbps) that has
better error-correction codes that give a boost in speed of about 50% and
allows several call channels to be used as one - up to four channels -
resulting in a maximum speed of 57.6 kbps.
HSCSD was never
widely adopted outside Europe.
HSDPA (High-Speed
Downlink Packet Access)
An upgrade for UMTS
networks that doubles network capacity and increases download data speeds by
five times or more.
The service was
initially deployed at 1.8 Mbps but upgrades to the networks and new user
devices led to increased rates of 3.6 Mbps, followed by 7.2 Mbps.
HSDPA only handles
the downlink while the uplink is handled by a related technology called HSUPA.
The combination of both technologies is usually called HSPA.
HSP (Headset Profile)
A Bluetooth profile
that enables wireless connection between a phone and a Bluetooth headset. It
supports simultaneous two-way audio but not stereo.
It is one of the most
common profiles with only a small number of phones supporting only the similar
Handsfree profile.
HSP is used by other
devices as well, a Bluetooth-enabled PC with VoIP software such as Skype for
example.
HSUPA (High-Speed
Uplink Packet Access)
An upgrade for
UMTS/HSDPA networks that increases upload data speeds up to 5.76 Mbps. HSUPA together
with HSDPA are sometimes referred to as HSPA.
The standard is
backwards compatible with UMTS and HSDPA and will work with devices supporting
only those standards.
HSUPA only handles
the uplink while the downlink is handled by a related technology called HSDPA.
HTML (Hypertext
Markup Language)
A standard markup
language used to create web pages.
It was designed with
desktop computers in mind and web pages may have reduced usability when viewed
on devices with smaller screens and limited input options (as is the case with
most mobile phones).
There is a newer
format called XHTML that is better suited for mobile devices.
Hz (Hertz)
A unit of frequency
measurement equal to one cycle per second.
I
iDEN (Integrated
Digital Enhanced Network)
A TDMA based digital
mobile network system. It was developed by Motorola, which remains the main
manufacturer for iDEN devices. The main advantage of iDEN is the Push-To-Talk
system, which enables mobile phones to be used as walkie-talkies.
Newer iDEN phones use
a SIM card that is compatible with GSM phones for international roaming, but
only a few phones support both standards.
IMAP (Internet
Message Access Protocol)
An Internet protocol
used by email clients to access messages from a server. IMAP is a newer
alternative to POP3.
Unlike POP3, which
only downloads the messages, IMAP synchronizes them with the email server and
tracks changes in their status. Another feature of IMAP is that it allows
messages to be organized by folders and the email client setup to use IMAP
access will also synchronize the folders beside the emails themselves.
IMEI (International
Mobile Equipment Identity)
IMEI is a unique
15-digit serial number that uniquely identifies a GSM or UMTS mobile phone. It
consists of four parts and provides information, such as the manufacturer, to
the mobile network. It is usually printed on the device under the battery.
IMEI can be used to
"ban" a stolen phone, making it hard to use by the thief with a new
SIM card.
IP (Internet
Protocol)
IP is the the protocol
used for communicating data across a packet-switched network used in most
publicly accessible networks today. Connections that mobile devices make to
GPRS, 3G and similar networks are made using IP.
IrDA (Infrared Data Association)
·
A
standard for transmitting data using an infrared port. Transfer speeds are
roughly the same as traditional parallel ports.
·
The
industry group that created the IrDA technical standard.
Infrared connectivity
is an old wireless technology used to connect two electronic devices. It uses a
beam of infrared light to transmit information and so requires direct line of
sight and operates only at close range.
IR was superseded by
Bluetooth, which has the advantage of operating at longer distances (around 30
feet) and being omni-directional.
Many home devices
such as TVs and DVD players still use IR remote controls. Some smartphones are
capable of using their IR port to control these devises but that usually
requires third-party software.
J
Java
Often stands for
"Java ME" (the new name of J2ME, Java 2 Platform, Micro Edition).
Java ME is a platform for applications running on mobile phones. These, mainly
small, applications (e.g. games) can be downloaded from the Internet directly
to the phone using its built-in web-browser.
K
KB (Kilobyte)
A unit of digital
information equal to 1024 bytes. Also abbreviated as kB, K and Kbyte.
Kbps (Kilobits per
second)
A unit of data
transfer rate equal to 1024 bits per second.
Key Guard
A feature allowing
you to lock the keyboard to avoid any accidental dialing of a number or
pressing of keys while carrying the phone in a pocket or bag. The keyboard is
unlocked by a special sequence of keys unlikely to be pressed accidentally.
Key Lock Switch
A dedicated
switch/key/button that locks (and unlocks) a device's keypad.
L
Land line
Non-wireless
telephone connection.
LCD (Liquid Crystal
Display)
A liquid crystal
display is the most common display type among mobile phones because of its low
power consumption and good image quality. They are generally easy to read, even
under direct sunlight.
The smallest element
of an image displayed on a LCD is the pixel. Each pixel normally consists of a
layer of molecules aligned between two transparent electrodes, and two
polarizing filters.
Some of the types of
LCD displays are STN, TFT and TFD. The first one, STN, offers low cost and low
power consumption, but low image quality. TFT features greater image quality
and response time, yet its displays are more expensive and need more power.
Three other types of
LCDs are transmissive, reflective, or transflective. Transmissive displays
offer nicer image quality in low or medium ambient light, while reflective ones
work best in bright ambient light. Transflective displays combine the best of
both.
LED (Light-Emitting
Diode)
A semiconductor diode
that emits light when charged with electricity. They come in diverse colors and
some LEDs even contain multiple elements and are therefore capable of emitting
light with different colors.
LEDs are used for
displays, for keypad or display backlighting, etc. Bright white LEDs also can
be used as flashlights and flashes for mobile phones. Even if they are not as
bright as the xenon flash, LEDs are much more compact and require less energy -
and also can be used as video light.
Li-Ion (Lithium Ion)
This stands for a
type of rechargeable battery. They are much lighter than earlier battery types
(NiCd and NiMH), have a long life cycle and generally don't suffer from the
so-called "memory effect".
Li-Polymer (Lithium Polymer)
This stands for a
type of rechargeable battery which has evolved technologically from Lithium-Ion
batteries.
Current
lithium-polymer batteries are actually Lithium-Ion Polymer and perform
similarly to Lithium-Ion batteries. The advantage however of Li-Polymer
batteries is that they can be made much thinner.
Generally, they don't
suffer from the so-called "memory effect" common to NiCd and NiMH
batteries.
Linux
A family of
open-source operating systems. There are a lot of variants of Linux available
and they are developed and maintained by diverse working groups. There are also
some Linux-based OSes for mobile devices (e.g. Android or Maemo).
Location-Based
Services (LBS)
A term that refers to
a wide range of services based (or enhanced by) information about the physical
location of a user and/or device.
Typical examples of
location-based services for consumers are real-time turn-by-turn navigation,
the location of the nearest restaurant or hotel, vehicle tracking etc.
For a location-based
service to work there are some requirements to be fulfilled. The network must
support it, and certain technologies must be built into the mobile phone (such
as GPS and A-GPS).
Lock code
A code preventing the
unauthorized use of a mobile phone. the user isn't given access to the phone
without entering the right sequence of numbers using the keypad. Only emergency
or other predefined numbers may be dialed while the mobile phone is locked.
Long SMS
Also known as
"Concatenated SMS".
Long term evolution
(LTE)
LTE is the next-step
of the evolution of UMTS (3G) and HSDPA (3.5G). It's what is technically
correct called 4G. Some carries market especially high speed 3.5G HSDPA as 4G
network, but that's not correct.
Some of the
improvements LTE brings along over the currently used wireless mobile radio
technologies are a better spectral efficiency, lower costs, higher transfer
speeds, improved services, etc.
LTE networks are
widely commercially available in the USA. In Europe the network standard is not
as widely spread and there are individual networks available only in some
cities.
Theoretically, LTE
networks should provide wireless data download speeds of up to 300Mbps and
wireless download speeds of up to 75Mbps.
Loudspeaker
The loudspeaker is a
small sound driver fitted within a mobile phone, or other communication device,
which is used to produce sound. Traditionally, loudspeakers on mobile phones
are used to produce sound alerts for events such as incoming calls, incoming
messages and alarms.
Since mobile phones
have started doubling as portable music players in recent years, users have
begun using their built-in speakers for playback of music. Acknowledging this
new type of use of the mobile phone loudspeaker, manufacturers have begin to
equip their music or video-centric mobiles with more powerful loudspeakers or
even a pair of loudspeakers for accurate stereo reproduction and enhanced
spatial effects.
Loudspeakers are also
used to reproduce voice calls out loud, thus allowing users to deal with calls
hands-free or even have conference calls with others in the same room (that use
of the mobile phone is called a speakerphone, which is not to be confused with
a loudspeaker).
Loudspeaker
implementation can vary from model to model. For example, in order to save
space and make phones thinner, some manufacturers don't use a dedicated
loudspeaker but instead use the earpiece speaker to produce sound alerts as
well.
M
Macro
Most often this term
is use to describe the macro mode of a camera. This mode allows the taking of
photos from extremely short distance unlike close-ups, which also need an auto
focus lens but are shot from a slightly greater distance.
mAh
An ampere-hour or
amp-hour (Ah) is a unit of electric charge. Smaller batteries however, such as
those in mobile phones and digital cameras, are often rated in
milliampere-hours.
The milliampere-hour
(mAh) is one-thousandth of an ampere-hour and is a technical term for how much
electrical charge a particular battery will hold. As an example, using higher
mAh batteries in a device with constant electrical consumption will
theoretically give you longer operating times.
Mass Storage mode
A standard mode
allowing compatible phones to be connected to a computer's USB port and be used
as a removable storage drive without the need for any special drivers.
Usually, in Mass
Storage mode, the phone's memory is mounted as a removable drive by the
computer OS and cannot be used by the phone itself. That's the reason why some
phones only allow an inserted memory card to be mounted in Mass Storage mode
thus keeping their system partition inaccessible on the computer in this mode.
MB (Megabyte)
A unit of digital
information equal to 1,048,576 bytes or 1024 kilobytes.
Mbps (Megabit per
second)
A unit of data
transfer rate equal to 1,048,576 bits per second or 1,024 kilobits per second.
Megapixel
One million pixels.
Pixel comes from "pix" (for "picture") and el (for
"element"). A pixel is the smallest piece of information on an image.
This is a unit for measuring image resolution, and the more pixels a picture
consists of, the more detailed it is.
Memory card slot
A special slot for
inserting a memory card. Memory cards allow you to expand the phone's built-in
memory (or in the past these slots have been used to add some missing features
such as Wi-Fi connectivity).
Memory cards have
different capacities and are used to store and transfer files between
compatible devices. There are several types of memory cards. The most popular
and frequently used by mobile phone manufacturers is microSD; however, up until
recently Sony Ericsson exclusively used the Memory Stick Micro (M2) card type
developed by Sony.
Memory card slots can
have various supported memory card capacities. Depending on the device, card
slots can support capacities of up to 2, 4, 8, 16 or 32GB and more.
As manufacturers
rarely test their products for compatibility with newer and larger cards that
come out after a specific handset is out on the market, whenever it is
possible, we try to verify that larger capacity cards run on older phones.
When we confirm that
a mobile phone works with a larger capacity memory card than what the
manufacturer has advertized, we usually put that down in the phone specs sheet
in our database.
That way, when you
see the word "verified" in the Card slot field, you will know our
reviewing team has personally tested the device for compatibility with the
stated capacity and they are compatible even though it may not be officially
stated so by the manufacturer.
Still, you should take
that information with a pinch of salt, as your mileage with your specific unit
may vary.
Memory effect
Describes the gradual
shortening of a battery's life if the battery is recharged before it is
completely discharged. It is most common with nickel-based batteries such as
NiCd and NiMH types.
Messaging
In addition to pure
voice calls, all GSM carriers also offer messaging services and messaging has
been a core service since the beginning of GSM mobile telephony. Mobile
messaging ranges from SMS, through EMS, to IM and Email.
MHz (Megahertz)
Herz is a measure of
frequency per unit of time, or the number of cycles per second. The most common
uses for hertz are to describe radio and audio frequencies. It`s abbreviated as
Hz. 1 Megahertz, or 1 MHz, is equal to 1 million Hz.
Micro USB
A type of USB
connector. USB stands for "Universal Serial Bus". Devices connected
to the computer using a USB cable can easily exchange files and information (if
the device supports Mass Storage mode, the files can be transferred without the
need for special drivers or software).
Some devices can be
charged via the USB cable when connected to the computer. There are different
USB interfaces: MicroUSB (with two subtypes - Micro-A and Micro-B) is one of
them, and was developed to replace the older MiniUSB interface. However, the
latter is still the most popular connector type in portable devices.
microSD
A memory card is a
flash memory data storage device used in a wide range of digital devices such
as mobile phones, digital cameras, PDAs, music players, etc. They are small,
rugged and offer high re-record ability.
There is a wide range
of memory card formats. MicroSD (SD stands for "Secure Digital") and
M2 (memory Stick Micro) are the smallest at the current time. The microSD
format was originally called TransFlash or T-Flash.
microSDHC
The microSDHC cards
(HC as in High Capacity) upgrade the microSD standard. They have the same
physical dimensions but offer higher capacities (4-64+ GB) than the regular
ones (64MB-2 GB).
Microsoft Exchange
(Server)
A messaging and
collaborative software product developed by Microsoft as a PC-based e-mail
server. Targeted at the corporate world, Exchange's major features consist of
electronic mail, shared calendars and tasks, and support for mobile and
Web-based access to email accounts and information, as well as support for very
large amounts of data storage.
MIDI (Musical
Instrument Digital Interface)
A set of
specifications allowing computers, synthesizers, MIDI controllers, sound cards,
samplers and drum machines to control one another and exchange system data.
MIDI files keep
information that describes the instruments, notes and timing of the music. This
can then be recreated on MIDI-capable devices as music.
More sophisticated
MIDI devices can not only reproduce consecutive notes (monophony) but are able
to create realistic-sounding music by synthesizing several notes simultaneously
- polyphony. The more notes the synthesizer can play simultaneously, the nicer
it sounds.
MIDI files were
commonly used as mobile phone ringtones before the support for the MP3/AAC
standard was widely adopted.
MIDP (Mobile
Information Device Profile)
A standardized
runtime environment allowing the use of Java on embedded devices (e.g. mobile
phones). It is based on J2ME. Newer versions of MIDP (e.g. MIDP 2.0) increase
functionality by adding additional APIs.
Mil-Spec (MIL-STD)
Comes from
"Military Specification/Standard". With regards to mobile phones, it
normally refers to the US Army's set of standards, called MIL-STD 810.
These standards
specify the requirements that a rugged device must fulfill, such as surviving
certain environmental conditions.
There are lots of
sub-categories of the MIL-STD 810 referring to different extreme conditions. As
only a few devices support all sub-categories, it is important to note exactly
which of them is supported by a certain device. A capital letter added to the
name indicates which specifications are met - MIL-STD 810F for example means
resistance to rain, shock, vibration, dust, humidity, salt fog and extreme
temperatures.
Mini-USB
A type of USB
connector. USB stands for "Universal Serial Bus". Devices connected
to the computer using a USB cable can flawlessly transfer files and information
between the phone and the computer (if Mass Storage mode is supported files can
be transferred without the need of special drivers or software).
Some devices can be
charged when the USB cable is connected to the computer. There are different
USB interfaces: Mini-USB (with two subtypes - Mini-A and Mini-B) is one of
them,but it's in the process of being replaced by the newer and slimmer
Micro-USB interface.
The miniUSB connector
however is still the most popular connector type in portable devices.
miniSD
A memory card is a
flash memory data storage device used in a wide range of digital devices such
as mobile phones, digital cameras, PDAs, music players, etc. They are small,
rugged and offer high re-record ability and power-free operation.
There is a wide range
of memory card formats, miniSD (SD stand for Secure Digital) being one of them.
It's now considered an outdated standard and in the current generation of
portable devices has been replaced by the microSD and microSDHC formats.
MMC
A memory card is a
flash memory data storage device used in a wide range of digital devices such
as mobile phones, digital cameras, PDAs, music players, etc. They are small,
rugged and offer high re-record ability and power-free operation.
There is a wide range
of memory card formats. MMC (which stands for "Multi Media Card") is
one of the oldest formats and has been replaced by newer ones like SD, microSD
and microSDHC. Physically, it's fully compatible with SD cards.
MMCmobile
A memory card is a
flash memory data storage device used in a wide range of digital devices such
as mobile phones, digital cameras, PDAs, music players, etc. They are small,
rugged and offer high re-record ability and power-free operation.
There is a wide range
of memory card formats. MMC (which stands for "Multi Media Card") is
one of the oldest formats and has been replaced by newer ones like SD, microSD
and microSDHC.
MMCmobile cards are
based on the RS-MMC cards and share the same mini form factor. The difference
between them is that MMCmobile cards are dual-voltage and can operate in older
phones with a high-voltage (3V) slot as well as in newer models with a
low-voltage (1.8V) slot.
The MMCmobile
standard is now considered an outdated standard and has been replaced by newer
ones like microSD and microSDHC.
MMS (Multimedia
Messaging Service)
Abbreviated as MMS,
the Multimedia Messaging Service is a store and forward messaging service that
allows subscribers to exchange multimedia files as messages.
MMS supports the
transmission of various media types: text, picture, audio, video, or a
combination of all four. The originator can easily create a Multimedia Message,
by snaping a photo with the phone camera, or by using images and sounds stored
previously in the phone (or downloaded from a web site).
If the recipient
phone is not switched on or it has not been setup to receive MMS messages, the
Multimedia Message will be stored in a special repository offered by the GSM
carrier.
In order to send or
receive a MMS, the user must have a compatible phone that is running over a
GPRS or 3G network. Most current mobile phones and operator networks support
MMS.
The maximum message
size (along with the attachments) is generally limited to 300KB (MMS 1.2), but
recently the MMS 1.3 standard has allowed for a maximum size of 600KB. Wireless
carriers however can impose their own size restrictions. Whenever possible we
will try and state the MMS version supported by the individual handsets in our
database.
Mobile games
Many phones include
simple games for the user to pass the time. The games referred to here are ones
preinstalled on the phone and do not require a wireless connection to play.
With mobile phones
getting ever more powerful, the games are following suit in terms of complexity
and graphics. Some phones even have dedicated gaming keys and even look like
portable mini gaming consoles.
Some of the latest
phones have a built-in accelerometer sensor, which can be utilized by games to
provide more interactive gameplay. In those so-called motion-based games, you
can steer, for instance, by tilting your phone in the respective direction.
Usually, when there
are some games preinstalled, more can be downloaded over the air using the
phone's built-in web browser or they can be downloaded onto a desktop computer
and then transferred to the mobile phone via a data cable.
There are several
different technologies for downloadable games for feature phones, including
Java, BREW, Mophun, and WGE. The technologies are incompatible between each
other, although some phones support more than one of them.
Additionally, native
mobile games for smartphones with their respective mobile OSs also represent a
large share of the mobile game market.
Bear in mind that a
certain mobile phone model can be bundled with different games depending on the
regional market or even the network carrier.
Mobile IM (Instant
Messaging)
Mobile Instant
Messaging is the ability to engage in Instant Messaging services from a mobile
handset. Mobile IM allows users to address messages to others using a dynamic
address book full of users with their online status updated constantly. That
allows anyone participating to know when their "buddies" are
available for chat.
The advantage of
mobile IM is that messages are sent and received in real-time via mobile
handsets on-the-go without a stationary computer. Mobile IM is seen as a
natural evolution of the popular SMS service.
Mobile IM is
available from some operators or mobile phone manufacturers now, but unfortunately,
it is not always possible to use IM services between different operators.
When we state IM in
our specs sheet that usually means the phone is equipped with a proprietary IM
solution. Those solutions frequently rely on either carrier support or can be
used between users with handsets of one and the same make.
Fortunately, popular
third-party IM providers such as ICQ, Skype, Google Talk, MSN, AOL, Yahoo, etc.
are alleviating the situation by making their own mobile applications allowing
mobile phones to engage in Instant Messaging independently of their carrier or
mobile phone manufacturer. The only prerequisite is having internet access on
the go - over GPRS or 3G.
Mobile WiMAX
Mobile WiMAX (WiMAX
comes from "Worldwide Interoperability for Microwave Access") is a
technical wireless standard allowing web browsing and wireless data transfer on
the move. It's an another way of calling the 802.16e protocol.
WiMAX technology
provides the equivalent of broadband speeds without the need for cables, and service
coverage can extend over an entire city, region or even a whole country.
Access to the WiMAX
wireless service is subject to a monthly subscription and it requires the use
of a dedicated WiMAX modem, which is usually supplied for free by the operator.
WiMAX technology
allows for data transfer speeds of up to 75Mbps, but in reality they tend to be
a lot lower than that, at around 1-10 Mbps tops.
Modem
Comes from
"MOdulator/DEModulator". A device or a component of a device used for
transferring information. Information is encoded (the modem modulates the
signal) and decoded (the signal is being demodulated) so it can be transmitted
easily over a network (wireless, as well).
Monochrome
Literally "one
color". A monochrome display is commonly known as a black and white or
grayscale display. In mobile phones such black-and-white displays often utilize
a colored backlight such as green, blue or orange.
Monochrome displays
are no longer used for primary displays in mobile phones, but some are still
used as external secondary screens.
MP3 (MPEG Layer 3)
An audio storage
protocol that stores music in a compressed format with very little loss in
sound quality.
MP3 is the most
common MPEG format for audio files. MP3 files can be played using the music
player of the mobile phone or set as a ringtone.
MPEG (Motion Picture
Experts Group)
A wide range of
formats for digital audio and video files. The most common among them are
MPEG-4 (for video) and MP3 (for audio).
MPEG-4 video
MPEG-4 is one of the
latest video/audio compression method standardized by MPEG group, designed
specially for low-bandwidth (less than 1.5MBit/sec bitrate) video/audio
encoding purposes.
MPEG-4 is designed to
deliver DVD-quality video (MPEG-2) at lower data rates and smaller file sizes.
It should be noted
that unlike MPEG-1 and MPEG-2, the MPEG-4's predecessors, MPEG-4 itself isn't
just one unified encoding mechanism, but rather a group name for several
flavors of video and audio encoding methods that share certain same
characteristics. These "flavors" are often referred either as
"profiles" or "layers" in MPEG-4 compression scheme and
each new profile should be backwards compliant to the older, "lower"
versions of MPEG-4 in terms of playback capability.
Probably the
best-known MPEG-4 video encoders are called DivX and XviD, which both are
nowadays fully standard-compliant MPEG-4 encoders. The most common MPEG-4
profiles that both XviD and DivX use extensively are called "simple profile"
and "advanced simple profile".
Beside those two
standardized video encoding profiles, the MPEG-4 group has standardized several
other profiles. The most important ones are H263+ (which is used widely in
mobile phones, dubbed as 3GP) and H.264 (often also called as AVC or more
technically known as MPEG-4 Part 10).
Since MPEG-4 is a
container format, MPEG-4 files may contain any number of audio, video, and even
subtitle streams, making it impossible to determine the type of streams in an
MPEG-4 file based on its filename extension alone.
The official filename
extension for MPEG-4 Part 14 files is .mp4, thus the container format is often
referred to simply as MP4. However various file extensions are also commonly
used to indicate the content inside the MP4 container:
·
MPEG-4
files with audio and video generally use the standard .mp4 extension.
·
Audio-only
MPEG-4 files generally have a .m4a extension. This is especially true of
non-protected content.
·
MPEG-4
files with audio streams encrypted by FairPlay Digital Rights Management as
sold through the iTunes Store use the .m4p extension.
·
Audio
book and podcast files, which also contain metadata including chapter markers,
images, and hyperlinks, can use the extension .m4a, but more commonly use the
.m4b extension. An .m4a audio file cannot "bookmark" (remember the
last listening spot), whereas .m4b extension files can.
·
Raw
MPEG-4 Visual bitstreams are named .m4v.
·
Mobile
phones use 3GP, a simplified version of MPEG-4 Part 12 (a.k.a MPEG-4/JPEG2000
ISO Base Media file format), with the .3gp and .3g2 extensions. These files
also store non-MPEG-4 data (H.263, AMR, TX3G).
The common but
non-standard use of the extensions .m4a and .m4v is due to the popularity of
Apple's iPod, iPhone, and iTunes Store, and Microsoft's Xbox 360 and Zune.
Without mods, Nintendo's DSi and Sony's PSP can also play M4A.
Multitouch input
method
In mobile computing,
multi-touch refers to the capability of a touchscreen (or a touchpad) to
recognize two or more points of contact on the surface concurrently. The
constant tracking of the multiple points allows the mobile phone interface to
recognize gestures, which enable advanced functionality such aspinch-to-zoom.
The multi-touch
sensing doesn't work on the resistive type of touchscreens (budget touch
phones), the capability comes inherited in capacitive touchscreens (majority of
touch phones nowadays).
Apple is considered
the pioneer of multi-touch technology on mobile phones with their first iPhone.
They introduced the pinch-to-zoom gesture that is now available across various
platforms.
Music playback time
(battery life)
Music playback time
is the officially quoted longest time that a single battery charge will last
when you use the phone as a music player only.
Usually those numbers
are only achievable when the phone is set to Flight mode (i.e. all transceivers
are off) and the headphones are used (as opposed to the loudspeaker). These
numbers are best used as reference when comparing phones from the same
manufacturer because battery life measurement methodology will probably vary
from manufacturer to manufacturer.
Music Player
A mobile phone
application that allows you to listen to music files stored in the phone's
internal or external memory.
N
NAND Memory
NAND memory is a
popular type of flash memory.
Flash memory is
non-volatile computer memory that can be electrically erased and reprogrammed.
Non-volatile means that no power is needed to maintain the information stored
in the chip.
Flash memory is a
technology that is primarily used in memory cards and USB flash drives as solid
state storage and its main purpose is being an inexpensive way of storing or
transferring data between computers and other digital products. It's used as
primary storage memory on various portable devices due to its low cost, compact
size, high physical endurance and low power consumption.
Another popular type
of flash memory is NOR flash memory.
Network capacity
Network capacity is
the amount of traffic that a network can handle at any given time. This
includes the number of simultaneous voice calls and maximum data speeds.
Capacity varies by area.
Network coverage
The geographical area
covered by the network of a service provider. Within this area, the phone will
be able to complete a call using the carrier's network or a partner network.
NFC (Near Field
Communication)
NFC is a short-range
high frequency wireless communication technology that enables the exchange of
data between devices over about a 10 cm distance.
NFC is an upgrade of
the existing proximity card standard (RFID) that combines the interface of a
smartcard and a reader into a single device. It allows users to seamlessly
share content between digital devices, pay bills wirelessly or even use their
cellphone as an electronic traveling ticket on existing contactless
infrastructure already in use for public transportation.
The significant
advantage of NFC over Bluetooth is the shorter set-up time. Instead of
performing manual configurations to identify Bluetooth devices, the connection
between two NFC devices is established at once (under a 1/10 second).
Due to its shorter
range, NFC provides a higher degree of security than Bluetooth and makes NFC
suitable for crowded areas where correlating a signal with its transmitting
physical device (and by extension, its user) might otherwise prove impossible.
NFC can also work
when one of the devices is not powered by a battery (e.g. on a phone that may
be turned off, a contactless smart credit card, etc.).
NiCd (Nickel Cadmium)
Used to describe an
early inexpensive rechargeable battery type which, if not completely discharged
before charging, can suffer from the so called "memory effect" that
reduces the battery's life.
NiMH (Nickel Metal
Hydride)
Used to describe a
rechargeable battery type which, if not completely discharged before charging,
can suffer from the so called "memory effect" that reduces the
battery's life. The NiMH-batteries can hold more power than the NiCd-ones, and
also suffer much less from the "memory effect" than NiCd-batteries.
NOR Memory
NOR flash memory is
one of the two popular types of flash memory. The other is the newer NAND flash
memory.
Flash memory is
non-volatile computer memory that can be electrically erased and reprogrammed.
Non-volatile means that no power is needed to maintain the information stored
on the chip.
Flash memory is a
technology that is primarily used in memory cards and USB flash drives as solid
state storage and its main purpose is an inexpensive way of storing or
transferring data between computers and other digital products. It's used as
primary storage memory on various portable devices due to its low cost, compact
size, high physical endurance and low power consumption.
Numeric keypad
A standard phone
keypad consisting of the numbers from 0 to 9 and including the signs
"*" and "#".
Alphanumeric keypads
are an upgrade to those and are used to enter text as well as numbers. They
include alphabet characters - usually several letters are assigned to each of
the numeric keys - and you can toggle their input by pressing the corresponding
key several times, often referred to as "multi-tap" input.
O
OEM (Original
Equipment Manufacturer)
A company
manufacturing products that are branded and sold by another company. Often if
the product was originally designed by the OEM that is called an ODM (Original
Design Manufacturer).
OLED (Organic
Light-Emitting Diode)
A display technology
that consists of small dots of organic polymer which emit light when charged
with electricity.
OLED displays have
several advantages over the LCDs. They are thinner, lighter, brighter, need
less power, have better viewing angles, contrast and response time for video
and animation. OLEDs are also cheaper and easier to manufacture.
On the other hand,
LCDs offer better legibility in bright ambient light.
Optical Zoom
The zoom-feature
found in many cameras and camera phones that makes subjects appear closer than
they actually are (so they fill more of the image area). To create that
magnification effect cameras use a set of moving optical lenses - hence the
name "optical zoom".
The alternative to
optical zoom is digital zoom, which is a highly advertized feature on many
consumer devices equipped with a camera, but it doesn't offer many real
advantages.
Digital zoom
generally influences quite negatively the image quality of the captured images.
OS (Operating System)
An infrastructure
software component of a computerized system. It controls all basic operations
of the computer (or other electronic devices such as PDA, smartphone, etc.).
Among the most
popular desktop operating systems are Windows, Mac OS, and variations of Linux,
while the most widely used operating systems for mobile devices are Symbian and
Windows Mobile.
Mobile devices with
OS are called smartphones and can run full software applications (like games,
organizer or communication applications) on top of the OS. Standardized
operating system platforms make it possible to provide a consistent user
interface (and experience) across devices from diverse hardware manufacturers.
OTA (Over-The-Air)
Over-the-air is any
method of making data transfers or transactions wirelessly using the cellular
network instead of a cable or other local connection.
Most commonly, this
term refers to downloading or uploading content or software (such as downloading
ringtones, uploading images, etc.).
If the term is used
for updating a phone's firmware this is also known as FOTA (Firmware
Over-The-Air).
P
Packet Data
Packet Data - small pieces called packets. This allows users to consume a
network's resources only when they are actually transferring data. In mobile
phones, data is used for functions requiring Internet access (including video
or audio streaming).
Generally all technologies for wireless data transfer used by operators
(except WAP) rely on packet data - GPRS, EDGE, UMTS.
Pager
A small pocket-sized
one-way or two-way radio receiver that rings and/or vibrates when a
transmission is received. Optionally, it can also display a numeric and/or
alphanumeric message. Some pagers are capable of not only receiving but also
sending messages.
PC Sync
A feature allowing
the user to connect the mobile phone to a computer (via cable or wirelessly
using Bluetooth for example) and synchronize contact information, calendar and
notes between the phone and a specific computer application (such as MS Outlook
on PC).
PCS (Personal
Communications Service)
PCS or Personal
Communications Service is the name for the 1900 MHz radio band used for digital
mobile phone services in Canada, Mexico and the United States.
All CDMA, GSM, and
D-AMPS systems can be used on PCS frequencies.
PDA (Personal Digital
Assistant)
A handheld device
with basic computing and organizing functions. Most of them have a large touch
screen, a stylus and support handwriting recognition.
Normally, they also
have faster processors than typical mobile phones and can run more complex
software. Most of the PDAs run a standardized OS such as Windows Mobile for
Pocket PC or Palm OS.
Today, PDAs are being
pushed aside by capable smartphones, which can do all the same functions but
also offer telephony.
Phone Book Access
(PBA)
A Bluetooth
mode/profile allowing the phone to make its phone book (contact) information
available to another authorized and PBA compatible device (car or car accessory
e.g.). PBA allows the authorized device to handle phone book browsing and
dialing (including voice dialing by the car or car accessory).
Phonebook
Mobile phones are
equipped with a quite detailed phonebook. The available information fields
usually cover all the customary PIM requirements. Most of the times users can
even add custom fields when the default options are insufficient.
Computer
synchronization with a PIM application is quite important and most recent
mobile phones offer synchronization with Microsoft Outlook or through a
proprietary sync application.
Whenever possible we
will try and list the contact capacity for each mobile phone in our database as
accurately as possible.
Bear in mind that the
number of entry fields listed concerns only the handset memory, SIM cards will
usually offer an additional capacity of about 200-250 contacts.
PIM (Personal
Information Manager/Management)
A whole range of
software functions which organize personal information. A standard PIM suite
includes a scheduler for events, address book for contacts and a to-do list.
Email, text notes and/or voice notes, and alarms (reminders) may also be
included. Some mobile phones allow PIM data to be synchronized (also
automatically) with a PC and/or web-based PIM-service.
PIN code (Personal
Identification Number)
In mobile devices,
the PIN acts like a password preventing other people from gaining unauthorized
access to your device. This is a numeric code which must be entered each time
the device is started (unless the PIN security feature is turned off).
In GSM mobile phones,
the PIN is normally associated with the SIM card (not the phone) and must be
entered each time the phone is switched on. If a wrong PIN is entered three
times in a row the handset is locked until you enter another code, called a PUK
code.
Both the PIN and the
PUK codes are supplied by the operator, but only the PIN code can be changed by
the user.
Pixel
Pixel comes from
"pix" (for "picture") and el (for "element"). A
pixel is the smallest piece of information on an image. This is a unit for
measuring image resolution, and the more pixels a picture consists of, the more
detailed it is.
Pixel density (PPI)
Refers to the
concentration of pixels on a particular display, measured in pixels per inch
(ppi). Pixel density is calculated by dividing the diagonal pixel resolution of
a display by its diagonal size.
Polyphonic ringtones
With polyphonic
ringtones more than one musical note is played at the same time.
Unlike regular
ringtones, which can only reproduce consecutive notes (monophony), the
polyphonic ringtones are able to create realistic-sounding music by
synthesizing several notes simultaneously - polyphony. The more notes the
synthesizer can play simultaneously, the nicer it sounds. Usually mobile phones
synthesizers can reproduce from 4 to 72 simultaneous tones.
Polyphonic ringtones
should not be mistaken with the so called "True tones" (also known as
"Real tones") which are simply audio recordings, typically in a
common format such as MP3, AAC, or WMA.
POP3 (Post Office
Protocol)
An Internet protocol
used to download messages from an email server to an email client (a desktop
computer or mobile device application).
Port
A term that is
generally used to describe a physical connector that docks with another
connector (a type of plug on the end of a cable) to electronically connect two
devices. It is also called a "connector" or "jack".
Predictive text input
Allows the user to
enter text by pressing only one key per letter on a keypad where multiple letters
share keys. As a word is entered, the phone automatically compares all possible
letter combinations against a built-in dictionary of words, and determines
which word was intended to be typed by the user.
It is possible to
scroll (without re-typing) through all possible matches until the right word is
found. This feature allows faster and easier typing than the standard typing
method where some keys must be pressed several times until the right letter is
displayed on the screen (a.k.a. multi-tap).
The most popular
types of predicative text entry are T9 and Motorola's iTAP.
PTT (Push-To-Talk)
A two-way
communication service which works like a "walkie-talkie".
PTT is half-duplex so
communication can only be transferred in one direction at a time in contrast to
mobile phone calls which are full-duplex and both parties can hear each other.
PTT requires the
person speaking to press a certain button while talking and to release it when
they are done so the listener can answer by repeating the same steps. In this
way people control which one can speak and be heard and the system knows in
which direction the information should be transferred.
Most PTT systems
allow group calls (one person speaks to all the members of the group).
The newest PTT
systems use VoIP technology and the signal is transferred over the 2.5G or 3G
network.
PUK Code (PIN UnlocK
Code)
A PUK code is
required if a GSM SIM card was locked after entering the wrong PIN code three
times in a row. Entering a wrong PUK code ten times in a row disables the SIM
card permanently. Both the PIN and the PUK codes are supplied by the operator,
but only the PIN code can be changed by the user.
Push
A general term
referring to technologies which allow a central system (such as the network) to
"push" (send) information spontaneously and quickly to a user without
any action on the part of the user or the mobile device.
A very common
"push" technology is email. "Push" emails are directly
"pushed" to the mobile device as soon as the email server receives
them and it is not necessary for either the user or the device to manually or
automatically check for new emails at regular intervals.
Q
QCIF
(Quarter Common Intermediate Format)
QCIF images or videos are 176 pixels wide and 144 pixels tall (176 x 144
pixels). The name Quarter CIF is written as QCIF and the resolution is four
times smaller than the CIF resolution (352 x 288 pixels). QCIF is smaller than
CIF, QVGA, and VGA.
Quad-band
Refers to a mobile
phone that supports the four major GSM frequency bands (850/900/1800/1900 MHz),
making it compatible with all the major GSM networks in the world. The 850/1900
MHz bands are mainly used in the US, while the 900/1800 MHz ones are available
in most other countries worldwide.
QVGA (Quarter Video
Graphics Array)
QVGA images or videos
are 320 pixels wide and 240 pixels tall (320 x 240 pixels). The name Quarter
VGA is written as QVGA and the resolution is four times smaller than VGA
resolution (640 x 480 pixels).
QWERTY keyboard
layout
Stands for a standard
layout for letter keys on text keyboards. This term comes from the first six
letter on the top row of a standard English keyboard and refers to devices that
offer a keyboard with that kind of layout.
Such a keyboard makes
typing much easier and faster even though sometimes (on mobile devices such as
mobile phones) keys are small and placed too close to each other.
R
RAM (Random-Access
Memory)
This is the memory
where the software resides while it is running along with the data it is using.
RAM is used by both OS and application software.
RAM is very fast but
volatile, meaning that all information is lost when electric power is cut off.
That makes it useful for temporary storage of data that requires fast access.
Normally, devices
with RAM also have another type of storage memory (flash memory or a hard
drive) that stores the information while the power is off.
Devices with more RAM
can run more complex software and multiple applications at the same time.
RBDS (Radio Broadcast
Data System)
Radio Broadcast Data
System is the official name used for the U.S. version of RDS, though the
"RDS" name seems to be at least as common in daily usage. The two
standards are nearly identical, with only slight differences, mainly in which
numbers are assigned to each of the 31 music and other program formats the RBDS
system can identify.
Generally, mobile
phone RDS implementations make use only of Radio Text info. It's 64-character
free-form textual information that can be either static (e.g. station slogans)
or in sync with the programming such as the title and artist of the
currently-playing song.
Mobile phone FM
tuners don't receive some of the RDS information that may be available, such as
time, program type (PTY) or traffic announcements (TA/TP).
RDS (Radio Data
System)
Radio data system or
RDS is a standard for sending small amounts of data through conventional FM
radio broadcasts. The RDS system standardizes several types of information
transmitted, including track/artist info and station identification.
Resistive touchscreen
Resistive
touchscreens operate by sensing direct pressure applied by the user. It can be
activated by pressing it not only with a finger but also with a stylus (unlike
the competing capacitive technology).
A resistive touch
screen consists of a touch layer placed on top of a standard display. The touch
layer normally includes two transparent electrical layers separated by a small
gap.
Pressing the
display's surface causes the two separate layers to come into contact, which
creates an electrical connection that can be sensed and located.
Resolution
A term that refers to
the number of pixels on a display or in a camera sensor (specifically in a
digital image). A higher resolution means more pixels and more pixels provide
the ability to display more visual information (resulting in greater clarity
and more detail).
Resolution does not
refer to the physical size of the display, camera sensor or image. For example,
two displays with the same resolution can have different physical dimensions.
And since there will be more pixels per inch on the smaller one, the image
provided by it should be clearer and more detailed (although graphics will be
physically smaller).
Ringer ID
Allows users to
assign specific ringtones to individual phone book entries so they can be identified
by the ringtone when calling.
Ringing profiles
Features allowing
users to create distinct profiles consisting of detailed ringer settings. Those
profiles can be easily accessed and activated when needed.
A wide array of
options can be changed by the user in each profile (such as tones, vibration,
melodies, ringer volume, etc.) and changes take effect all at the same time
when this profile is activated.
Ringtone
That is the sound
that a phone makes to indicate an incoming call.
Roaming
Refers to using a
mobile phone outside of your service provider's coverage area. Typically,
service providers charge higher fees for calls, messages and access to the
Internet.
ROM (Read-Only
Memory)
A form of data
storage. This type of memory keeps the saved data even if the device power is
off. The data on the ROM can be loaded into the RAM if needed.
The word Read-Only
identifies it as "read-only memory", since the reprogramming process
is generally infrequent, comparatively slow, and often does not permit random
access writes to individual memory locations.
RS-MMC (Reduced-Size
Multi Media Card)
A type of memory card
that was popular in the past.
Memory cards are
based on Flash memory and are used as solid state storage, their main purpose
being an inexpensive way to store or transfer data between computers and other
digital products.
RS-MMC are based on
the MMC standard and share their form-factor and size with MMCmobile cards. The
difference between the two formats is that MMCmobile cards are dual-voltage and
can operate in older phones with a high-voltage (3V) slot as well as in newer
models with a low-voltage (1.8V) slot. Traditional RS-MMC cards can only work
in devices with a high-voltage (3V) slot.
RSA (Rural Service
Area)
A geographic area of
population defined by the US Census Bureau. RSA stands for areas which are not
within an MSA (Metropolitan Statistical Area). Both divisions were used by the
FCC to geographically separate cellular frequency licenses granted to wireless
carriers in the 1980s.
RSS (Rich Site
Summary)
A family of XML-based
web feed formats used to publish frequently updated information such as news
headlines, blog entries, etc.
RSS feeds are very
lightweight (especially compared to full web pages) and are ideal for mobile
devices which often suffer from limited bandwidth and screen size.
A special software
(called RSS-reader) is needed for the RSS feeds to be displayed.
Ruggedized (Rugged)
Ruggedized devices
(e.g. mobile phones) offer protection against rough use and/or a rough environment.
For example, such devices are normally resistant to shock, water and dust. In
order to measure the level of protection manufacturers usually get standard
certificates in one or several of the available systems. Such standardization
systems include the US Military Standard (MIL-STD or Mil-Spec) or the Ingress
protection rating (IP).
S
S60 user interface
S60 (formerly known
as Series 60) is one of the major smartphone user interfaces. It is developed
mainly by Nokia and uses the Symbian OS as its base. Besides using it in all of
its own smartphones, Nokia also licenses S60 to other manufacturers such as
Samsung and LG.
S60 is capable of
running native third-party S60 applications as well as regular Java
applications.
There are several
releases of the S60 UI and chronologically they include Series 60 (2001),
Series 60 Second Edition (2004), Series 60 3rd Edition (2005) and S60 5th
edition (2008).
Thrid-party software
written for S60 1st Edition (S60v1) or 2nd Edition (S60v2) is not compatible
with S60 3rd Edition (S60v3) and later because it uses a new version of the
Symbian OS (v9.1).
The latest S60 5th
edition was announced in October 2008. Nokia decided to move directly from the
3rd Edition to the 5th Edition "as a polite gesture to Asian customers"
since the number four is considered bad luck in some Asian cultures.
The major feature of
S60 5th Edition is support for high-resolution 640x360 touchscreens. Before the
5th Edition, all S60 devices had a button-based user interface.
S60 5th edition has
some support for third-party software developed for S60 3rd edition but, it's
currently limited and somewhat hit-and-miss.
SAP (SIM Access
Profile)
SIM Access Profile is
a Bluetooth profile allowing a GSM phone to share its SIM card with another
device of the same type.
SAR (Specific
absorption rate)
Each GSM handset has
a radio transmitter and receiver in order to operate in the wireless GSM
network. That transceiver is manufactured so that when used next to the ear and
when worn on the belt, it won't exceed the limits for exposure to radio
frequency energy set by the authorities.
The authorities in
question here are the Federal Communications Commission (FCC) of the U.S.
Government, Industry Canada of the Canadian Government (IC), and the Council of
the European Union.
These limits are part
of comprehensive guidelines that establish permitted levels of RF energy for
the general population. The guidelines are based on standards that have been
developed by independent scientific organizations through periodic and thorough
evaluation of scientific studies.
The exposure standard
for wireless devices employs a unit of measurement known as the Specific
Absorption Rate, or SAR. Unfortunately the limits set by the FCC/IC and the
Concil of the European Union are measured over different amount of tissue so
they are not directly comparable.
·
The SAR
limit set by the FCC/IC is 1.6W/kg averaged over 1 gram of actual tissue.
·
The SAR
limit recommended by the Council of the European Union is 2.0W/kg averaged over
10 g of actual tissue.
Although the SAR is
determined at the highest certified power level, the actual SAR level of the
device while operating can be well below the maximum value. This is because GSM
phones are designed to operate at multiple power levels so as to use only the
power required to reach the network. In general, the closer you are to a
wireless base station antenna, the lower the power output of the device and
vice versa.
You will
find we list several SAR values. The reason for that is the FCC/IC have
stipulated that SAR should be measured at both hip level (making calls while
carrying the phone at the waist) and at head level (making calls with the phone
put next to ear). So you are almost certain to see two SAR values for the
FCC/IC standard.
The Council
of the European Union only requires the measurements at ear level so most
manufacturers don't measure SAR at hip level for European models. So in this
case you are almost certain to see a single SAR value only for the EU standard.
Screen protection
As touchscreen
displays are growing larger in recent years, the need for enhanced scratch
resistance and protection of the screens created the demand for usage of screen
covers of increased resistance including chemically hardened glass.
Corning's Gorilla Glass
is a popular brand of hardened glass used for high-end handset in the mobile
industry.
Additionally,
manufacturers has started applying oleophobic coating on top of its screens to
make finger smudges less of an issue.
SD (Secure Digital)
Secure Digital or SD
is a popular type of memory card. Memory cards are based on Flash memory and
are used as solid state storage, their main purpose being an inexpensive way to
store or transfer data between computers and other digital products.
The dimensions of an
SD card are 24 x 32 x 2.1 mm, which makes it smaller than CompactFlash but
larger than miniSD, microSD (TransFlash) and RS-MMC.
SD cards are about
the same size as MMC but a bit thicker. They provide a bit more speed than MMC
at the expense of higher power consumtion. SD cards also provide a hardware
lock that can protect the stored data from being erased.
Secondary camera
This refers to a
second, usually lower-resolution camera, typically positioned on a device so as
to face the user in applications such as video conferencing.
Sensors
Modern mobile phones
come with a variety of sensors that automate or easy many of our daily tasks.
This field takes into account the presence of an accelerometer, a gyroscope, a
compass, and a barometer.
Accelerometer
and gyroscope
Accelerometers in
mobile phones are used to detect the orientation of the phone. The gyroscope,
or gyro for short, adds an additional dimension to the information supplied by
the accelerometer by tracking rotation or twist.
An accelerometer
measures linear acceleration of movement, while a gyro on the other hand
measures the angular rotational velocity. Both sensors measure rate of change;
they just measure the rate of change for different things.
In practice, that
means that an accelerometer will measure the directional movement of a device
but will not be able to resolve its lateral orientation or tilt during that
movement accurately unless a gyro is there to fill in that info.
With an accelerometer
you can either get a really "noisy" info output that is responsive,
or you can get a "clean" output that's sluggish. But when you combine
the 3-axis accelerometer with a 3-axis gyro, you get an output that is both
clean and responsive in the same time."
Digital
compass
The digital compass
that's usually based on a sensor called magnetometer provides mobile phones
with a simple orientation in relation to the Earth's magnetic field. As a
result, your phone always knows which way is North so it can auto rotate your
digital maps depending on your physical orientation.
Barometer
And finally, you may
see a device sporting a barometer in its specs sheet. Contrary to what you may
suggest, it has nothing to do with weather. Instead, the barometer is there to
help the GPS chip inside the device get a faster lock by instantly delivering
altitude data.
Side Keys
The side keys are the
buttons situated on the sides of the phone that you can use while holding the
phone in one hand.
SIM
A subscriber identity
module is a removable smart card for mobile phones. SIM cards store the
required information to identify the mobile device. It also contains data
required for voice encryption to make listening in on calls almost impossible
(except when the wireless carrier itself is doing the eavesdropping).
In this way the
customer ID (and personal number) is tied to the SIM card and not to a certain
mobile phone. This allows for a seamless interchange of the same SIM card
between different GSM mobile phones.
SIM cards also serve
as storage for SMS messages and the user's contacts. Current SIM cards can
store up to 250 name/number pairs and up to 50 SMS text messages.
The SIM card cannot
store multiple numbers per contact or other more complex information. This
means that if you copy your contacts info from the phone memory to the SIM
memory, contacts get broken up into as many entries as there are numbers for
each individual contact and discards the other information.
All GSM phones and
most iDEN phones require a SIM card to operate.
There are certain
types of phones (CDMA, TDMA, AMPS) that do not use a SIM. Instead, the required
data is programmed directly into the phone.
The SIM cards come in
two standard sizes: the first one 85.60 x 53.98 x 0.76 mm and the newer and far
more popular version 25 x 15 x 0.76 mm.
There are two numeric
passwords associated with a SIM card. One is the Personal Identification Number
(PIN) that the user must input each time they start the device (this can be
turned off via the phone settings).
When entering the PIN
number the user has only three input attempts. If all three are incorrect, the
card gets locked and a PUK (Personal Unblocking Key) must be entered in order
for the card to work again. Only ten attempts to enter the PUK are permitted
before the card is permanently locked and made unusable.
SIM lock
GSM phones can be
"locked", that is made to accept only SIM cards belonging to a
specific network. Typically, this is done so that phones will work only on the
network of the carrier.
SIM-locked phones are
usually locked to a carrier when the carrier sells the device at a subsidized
price in order to attract new subscribers to its services.
Some carriers offer a
SIM unlock option to their subscribers after a certain amount of time has
passed. Unlocking the phone can be done by entering a special code which is
generated based on the phone's unique IMEI number.
Some third-party
shops offer unauthorized unlocking of SIM-locked phones, but using their
services usually voids the official warranty of the phone.
Single-Band
A single-band phone
is one that operates on one frequency only. This makes the phone unable to
operate in areas where the service providers do not support its frequency.
Skin
See Theme.
Smartphone
A smartphone is a
term used to describe a category of mobile devices with computer-like functionality.
These devices sport complete operating system and have a platform for
application developers.
Currently, the two
major smartphone platforms in use are Android (by Google) and iOS (by Apple).
An application written for a specific platform can usually work on any
smartphone using the same platform.
Applications for
smartphones are also faster and better integrated with the phone's UI than Java
applications. Smartphones have larger displays and faster processors than
so-called feature phones or dumb phones .
SMIL
Synchronized
Multimedia Integration Language is a standard for interactive audiovisual
presentations and is commonly used in mobile phones' MMS messaging. These
messages integrate text with images and audio/video streaming. The abbreviation
SMIL is read as "smile". A typical SMIL presentation consists of
multiple "slides" playing in sequence.
SMS (Short Messaging
Service)
SMS or the Short
Messaging Service allows users to send and receive personal text messages
directly between mobile phones or sometimes to email adresses. Each message can
be up to 160 characters long (when using the default character set) and can be
sent to and from users of different operator networks. All mobile phones
support SMS.
Recently mobile
manufacturers have started offering special reading layouts for SMS inspired by
Instant Messengers such as ICQ, Skype, and MSN. The so-called threaded message layout orconversation-style layout displays the incoming and outgoing
messages between two participants in a single pane ordered chronologically.
This enhancement
reflects the recently prevalent use of SMS as a type of instant messaging much
like you would chat on a computer. When possible we try to explicitly state
that a mobile phone supports this enhanced messaging view.
SNS (Social network
service)
A social network
service or social networking service, most often called SNS, is a medium for
establishing social networks of people who share interests and/or activities.
Social networking
sites allow users to share ideas, activities, events, and interests within
their individual networks. Most social network services are web based and
provide means for users to interact in various ways, such as e-mail and instant
messaging.
Modern
internet-connected always-online phones stake a lot on SNS connectivity and
integration with the various services getting more popular than ever.
Soft keys
Soft keys (a.k.a
context keys) are keys with varying functionality depending on the context they
are used in. These are usually situated right under the display and their
current function is shown above it.
Soft Reset
A Soft Reset is the
act of rebooting or restarting your device in order to clear its internal
(non-storage) memory of running programs. This is a way to start afresh if an application
is causing problems and is normally only used on smartphones.
Windows Mobile
smartphones usually have a dedicated soft reset pinhole that can only be
pressed with a sharp, pointed object such as a stylus. It's designed to perform
a soft reset when the device becomes unresponsive.
Speed Dial
A feature present on
all mobile phones that allows the user to program a button from the
alphanumeric keypad to automatically dial a custom phone number upon a longer
press.
Stand-by time
(battery life)
Stand-by time is the
officially quoted longest time that a single battery charge will last when the
phone is constantly connected to the GSM network but is not in active use.
The stand-by time is
highly dependent on the cellular network environment, such as the distance to
the closest GSM cell tower (base station). Moving the phone (as in a vehicle)
also negatively affects battery life.
Manufacturers measure
talk time in controlled conditions and the quoted numbers are rarely reached in
real-life scenarios. These numbers are best used as reference when comparing
phones from the same manufacturer because battery life measurement methodology
will probably vary from manufacturer to manufacturer.
Quite often you will
find the Stand-by time field in the specification pages of new phones empty as
the manufacturers sometimes fail to disclose the info at the official
announcement. Later on when the handset hits the market, the figures are
usually revealed and accordingly, we take the care to add them to the database.
Stereo Speakers
Stereo speakers are
two speakers built into a single device. They are usually positioned on the
left and right side of the device and each speaker uses the respective channel
of stereo sound, thus producing a stereo effect.
Streaming Video
Streaming video is a
feature that allows real-time viewing of web video on a mobile device. This
allows users to enjoy a video without downloading it prior to watching.
Stylus
A small mechanical
tool used to work with touch-screen devices. It is usually a simple stick of
plastic or metal in the shape of a thin pen which has a softened tip so that it
does not damage the screen.
Because of its
familiar shape, handwriting and drawing on the touch-screen is much easier for
the user, and it achieves far greater accuracy than a fingertip.
Sub-QCIF
Sub-quarter common
intermediate format is the smallest standard image size. With its resolution of
128 x 96 pixels, it provides low-resolution video clips and streaming video on
mobile phones.
SVGA
Super video graphics
array is a standard size for images and displays. SVGA indicates a resolution
of 800 x 600 pixels.
Symbian
Symbian OS is an
operating system designed for mobile devices.
The Symbian OS is
used as the underlying base for two major smartphone platforms: S60 and UIQ.
Generally, applications written for one of these platforms are not compatible
with the other but as they use the same underlying OS it is easier for
developers to convert applications from one of them to the other. The Symbian
OS introduced major changes to version 9 that made all previous software
incompatible without updating. The platforms based on Symbian subsequent to
version 9 are the UIQ 3.0 and later, as well as S60 3rd edition.
SyncML
SyncML is a standard
for personal organizer data synchronization between different devices. This can
cover any type of personal organizer data, such as contacts, to-do lists, notes
etc.
The devices
synchronized can be mobile devices (phones, PDAs) as well as stationary ones
(PCs). SyncML even enables synchronization with web sites as it features an
XML-based standard that all SyncML-compatible devices can recognize.
T
Talk time (battery
life)
Talk time is the
officially quoted longest time that a single battery charge will last when you
are constantly talking on the phone.
The talk time is
highly dependent on the cellular network environment such as the distance to
the closest GSM cell tower. Moving fast while talking (as in a vehicle) also
negatively affects battery life.
Manufacturers measure
talk time in controlled conditions and the quoted numbers are rarely reached in
real-life scenarios. These numbers are best used as reference when comparing
phones from the same manufacturer because battery life measurement methodology
will probably vary from manufacturer to manufacturer.
Quite often you will
find the Talk time field in the specification pages of new phones empty as the
manufacturers sometimes fail to disclose the info at the time of the official
announcement. Later on, when the handset hits the market, the figures are
usually revealed and accordingly, we take the care to add them to our database.
TCP/IP
Transmission Control
Protocol and Internet Protocol are in fact two cooperating protocols that are
essential parts of the Internet protocol set. The TCP breaks the data into
packets while the IP routes them.
TD-SCDMA (Time
Division-Synchronous Code Division Multiple Access)
TD-SCDMA is a 3G
format of choice for the national standard of 3G mobile telecommunication in
China. TD-SCDMA was chosen as an attempt to escape dependency on the already
implemented Western spread spectrum technology as using Western 3G formats
calls for payment of high patent fees to a large number of western patent
holders.
The launch of a
national commercial TD-SCDMA network in China is still postponed and the
technology is currently undergoing extensive field testing.
On January 7, 2009
China granted TD-SCDMA 3G licence to the national GSM carrier China Mobile.
Networks using other 3G standards (WCDMA and CDMA2000 EV/DO) have still not
been launched in China, as these are delayed until TD-SCDMA is ready. The two
standards, WCDMA and CDMA-2000, are assigned to China Unicom and China Telecom,
respectively.
TEST
UMTS or the Universal
Mobile Telecommunications System is a third generation wireless network
technology which allows speeds of up to 2Mbps.
UMTS is based on the
WCDMA technology, which is why these terms have become interchangeable.
Tethering
In the context of GSM
mobile phones, tethering describes the process of connecting a phone to a
computer so that the computer can access the internet via an EDGE/UMTS/HSDPA
network. In this way, the mobile phone acts as a modem for the computer.
That specific use of
the word "tethering" stems from the fact that to be used as a modem, the
mobile phone usually has to be connected to the computer via a USB data cable.
In recent years however the same thing has become possible without cables by
using a Bluetooth connection.
Thus, tethering has
turned into a generic term for using your mobile phone as a GSM modem for your
computer.
Some carriers require
that you sign up for special plans in order to use your phone for tethering,
while for others it's simply a matter of paying the data traffic used, much
like you pay for browsing on your mobile phone.
Text messaging
(texting)
Text messaging is a
service allowing text messages to be sent and received on a mobile phone. This
is also known as SMS (Short Message Service).
TFD (Thin Film Diode)
TFD is a kind of
Liquid crystal display (LCD) technology. It is an active-matrix technology
which means that a diode is situated next to each pixel making it possible for
the pixels to be turned on and off individually. This allows a quicker response
time and more contrast than passive-matrix technologies.
TFD takes the
excellent picture quality and the fast response of TFT displays and combines
them with the low power consumption and cost of the STN ones.
TFT (Thin Film
Transistor)
TFT is one of the
best Liquid Cristal Display technologies in terms of image quality and response
time. However, it also consumes more power and is more expensive.
TFT, like TFD, is an
active-matrix technology. This means a transistor is located next to each
pixel, allowing it to be turned on and off individually. This ensures faster
response time and greater contrast.
Theme
A theme is a motif
used in the user interface of a device. It usually consists of set of matching
elements to create the look of the menus, text boxes etc. Another popular term
used to describe this is 'skin'.
Themes or skins allow
the user of the device to customize the interface to reflect their own tastes.
To-Do list
The To-Do list is a
type of organizer application available on most mobile phones. It allows the
user to write down a list of personal tasks. These can also be prioritized and,
if needed, assigned a due date.
Touchscreen
Refers to a display
which responds to direct touch manipulation, either by finger, stylus, or both.
Trackball
A trackball is
pointing device allowing four-axis control. It consists of a small ball
embedded on the device surface, partially exposed so the user can move a finger
across it to rotate it in any direction. This allows fast scrolling in any
direction.
Transflash
Refer to microSD.
Transflective
A transflective -
also known as transreflective liquid crystal - display (LCD) is one that is
able to reflect most of the sunlight it is exposed to and automatically adjust
its backlighting depending on the amount of light shining on it. This strongly
reduces the need for manual light adjustment of the screen.
Transflective LCD
displays combine the benefits of transmissive and reflective ones, which makes
them equally readable in both bright sunlight and low-light conditions.
Tri-band
A Tri-band GSM phone
is one that supports three of the four major GSM frequency bands, allowing it
to work in most parts of the world. The two most common kinds of tri-band GSM
phones are the European type, which support the 900, 1800 and 1900 frequencies
and the American type, which cover the 850, 1800 and 1900 frequencies.
U
UI (User Interface)
User Interface is the
software front for interacting with the technical features of a mobile phone.
Although the term can
also be used for hardware input such as controls or keys, in the area of mobile
phones it's most frequently used to refer to the software-controlled elements
displayed on the screen that are used to interact with the device. That
includes icons in the menus, text boxes, etc.
User Interfaces that
are easier to use than others are referred to as more user-friendly.
UIQ
UIQ is a touchscreen
user interface for the Symbian OS. Owned and developed by Sony Ericsson and
Motorola, the user interface is now outdated and the software company UIQ
Technology filed for bankruptcy on 5 January 2009.
UMA
Unlicensed Mobile
Access enables access to cellular mobile voice and data services over
unlicensed spectrum technologies such as Bluetooth or Wi-Fi (802.11).
The idea behind this
technology is the following: when there is an accessible Wi-Fi hotspot near
you, the UMA-enabled device can connect to it and use the broadband connection
for making and accepting calls and sending and receiving data. It is very
similar to using wireless VoIP-telephony on your GSM mobile phone.
The UMA-enabled phone
is also be able to use regular GSM base stations as any normal mobile phone
can. The handset is able to seamlessly change connections between the licensed
cellular radio access network and the unlicensed IP network, even in the middle
of a call.
All you need to use
the new technology is a UMA-enabled device, an operator that supports UMA, and
an Internet broadband connection that you can access via Wi-Fi (WLAN).
The most important
difference from the widely known VoIP technology is that UMA is tightly linked
to the mobile radio network, which is used for routing, authentication and
billing. A call initiated using the Wi-Fi interface reaches the 2G core network
through the UMA Network and once the signal is transferred, it becomes
indistinguishable from the rest of the cellular traffic.
UMTS
UMTS or the Universal
Mobile Telecommunications System is a third generation wireless network
technology which allows speeds of up to 2Mbps.
UMTS is based on the
WCDMA technology, which is why these terms have become interchangeable.
Unlocked phone
A phone without a
carrier SIM lock.
Upload
Upload is also known
as uplink and means the one way connection from a device (phone, PDA, laptop
computer) to a network or server (mobile phone network, internet etc.).
UPnP (Universal Plug
and Play)
Universal Plug and
Play represents a couple of standards used to connect digital devices to both
wired and wireless networks. It's intended for use in PCs, TVs and some other
types of devices. In mobiles, UPnP is used to allow the sharing of media files
through Wi-Fi networks as well as to connect the device to a PC or a TV.
USB (Universal Serial
Bus)
USB is a standard for
a wired connection between two electronic devices, including a mobile phone and
a desktop computer. The connection is made by a cable that has a connector at
either end. One end, the one that plugs into the computer, is the same across
all USB cables while the one that plugs into the mobile device can be of
various types such as miniUSB, microUSB or a proprietary connector.
USB version 1.1
provides maximum speeds of up to 1.5 MB/s while the current version 2.0 is
about 40 times faster. The versions are backwards compatible and the speed is
limited by the slower device. Transferring data may require drivers to be installed
on the desktop computer but some phones offer "mass storage" mode
which means they appear as thumb drives to the computer and no special drivers
are needed.
In addition to their
data transferring application, USB cables also carry an electric charge that
can be used to power peripherals (such as USB mice or keyboards), and many
mobile phones can be charged through their USB port.
USIM
Refers to SIM card.
V
VGA (Video Graphics
Array)
One of the resolution
standards used for images, videos and displays. VGA means a resolution of 640
pixels x 480 pixels.
Video call
Video call is a 3G
network feature that allows two callers to talk to each other while at the same
time viewing live video form each other's phone. To make a video call, both
users should have 3G phones which support this feature and they both need to be
in range of a 3G network.
Video Codec
A video codec is the
part of the software that handles converting stored digital information back to
images and vice-versa. Different codecs have different capabilities, making
them suitable for different applications.
Regular feature
phones come with a fixed set of video codecs, while the capability of
smartphones to playback different codecs can usually be expanded by installing
third-party solutions.
The most popular
mobile codecs are H.263 used in 3GP videos, H.264 in MPEG4 videos, and DivX and
XviD for avi files.
Voice dialing
Voice dialing is a
feature most modern phones support. It allows the user to dial a number by a
voice command.
There are two ways
this is done. The first way is for the user to record the commands in advance
and then use them. This normally means that only the user who has recorded the
commands may apply them.
The other kind of
voice-dialing enabled phones use text recognition and no prerecording is
required. When someone issues a command these devices simply match it to the
nearest contact in the phone book.
This feature does not
depend on the speaker and usually performs better than the former method.
However, it is not commonly avaible, especially in older phones.
Voice mail
Voice mail is a
network feature offered by most networks. It is similar to an answering machine
and allows the caller to leave a voice message if the person called is
unavailable.
This feature means
that the person who received the message can listen to it whenever necessary.
Voice memo
Voice memos allow the
users of devices that support them to record a note that can be heard whenever
and wherever necessary. Some devices limit the duration of such memos whereas
other allow recording until they run out of memory.
VoIP (Voice over
Internet Protocol)
Voice over Internet
Protocol is a technology which allows the transmission of voice over data
networks. This makes normal phone calls over such networks possible.
VPN (Virtual Private
Network)
A set of
communication protocols that allows remote users to securely access a remote
network. An example of this technology is when you access your corporate
Intranet remotely from your mobile phone.
If your company has a
VPN server set up, you can enter the connection details on a supported device
and join the corporate Intranet with all user rights and privileges you would
have if you were physically there. At the same time, the connection remains
secure from unauthorized access.
W
WAP (Wireless
Application protocol)
WAP is an
international standard for applications that use wireless communication. Its
most common application is to enable access to the Internet from a mobile phone
or a PDA.
WAP sites are
websites written in or converted to WML (Wireless Markup Language) and accessed
via the WAP browser
WAP websites are now
considered outdated as most modern phones have web browsers with HTML support.
WCDMA(Wideband Code
Division Multiple Access)
Wideband CDMA is a
third-generation (3G) wireless standard which allows use of both voice and data
and offers data speeds of up to 384 Kbps.
The frequency bands
for WCDMA are as follows: Europe and Asia - 2100MHz, North America - 1900MHz
and 850MHz.
WCDMA is also called
UMTS and the two terms have become interchangeable.
Some parts of the
WCDMA are based on GSM technology and the networks are designed to integrate
the GSM networks at some levels.
Wi-Fi
Wi-Fi is a WLAN
(Wireless Local Area Network) technology. It provides short-range wireless
high-speed data connections between mobile data devices (such as laptops, PDAs
or phones) and nearby Wi-Fi access points (special hardware connected to a
wired network).
The most common
variant of Wi-Fi is 802.11g, which is capable of providing speeds of up to
54Mbps and is backwards compatible with 802.11b (providing up to 11Mbps).
There is currently a
new standard in the works called 802.11n (offering twice the speeds of 802.11b)
and there are already retail networking devices that support its draft
specifications.
Wi-Fi is much faster
than any data technologies operating through the cellular network like GPRS,
EDGE and even UMTS and HSDPA.
The range covered by
a Wi-Fi access point is from 30 to 100 meters indoors while outdoors a single
access point can cover about 650 meters.
Windows Mobile
Windows Mobile is one
of the major smartphone platforms and until recently the only touch-enabled
smartphone platform.
Windows Mobile
actually has two distinct editions - Windows Mobile Standard and Windows Mobile
Professional.
Software written for
either of the editions is not compatible with the other.
The main difference
between the editions is that Windows Mobile Professional supports touchscreen
and handwriting recognition.
Windows Mobile is a
product created by Microsoft but as the company does not produce any phones
itself, it licenses the platform to hardware manufacturers.
Before version 6 was
released the Windows Mobile Standard edition was known as Windows Mobile for
Smartphone, while the Professional edition was referred to as Windows Mobile
for PocketPC.
Wireless email
Email is everywhere
now and almost everyone has their own, password-protected email account.
Wireless email however is the ability to send and receive email over wireless
devices. As GPRS and 3G networks give users constant connectivity access to
their email, wireless email services are recently becoming increasingly
popular.
There are a wide
variety of handsets available today that support wireless push email services.
Push refers to
technologies that allow a central system, for example the mobile phone network,
to send - or push - information to an end-user without any action on their part
or on the part of the mobile device.
With push email,
emails are sent directly to the mobile device as soon as the email server
receives them rather than waiting for the user or email client to request the
email.
Today's push email
devices range from mid-priced mobile phones through to smartphones and
email-centric phones such as RIM's Blackberry.
As wireless email
solutions are widely integrated in corporate scenarios, support for the
existing corporate email services such MS Exchange ActiveSync, Blackberry
Connect or IBM Lotus as is getting more and more common in regular handsets.
Unfortunately, we
usually don't publish all the email services supported by the mobile phones in
our database. As this is the case, you should always seek further information
regarding support of specific services. When you see email support listed on
our specs pages, please bear in mind that it only guarantees basic POP and SMTP
protocols support and as manufacturers always like to point out, specifications
can always be changed without notice.
WLAN
Wireless Local-Area
Network is a way of providing a wireless high speed connection between data
devices or a data device and an access point over a short range. See Wi-Fi.
WMV (Windows Media
Video)
WMV stands for
Windows Media Video, a file format created for - and therefore most commonly
used to work with - Windows Media Player software which is featured on almost
all Windows platform-based devices.
Most third-party
video players also support the format or at least some of its versions.
X
Xenon flash
A xenon flash
produces an extremely intense full-spectrum white light for a very short
duration. It consists of a glass tube filled with xenon gas which emits a short
and very bright flash of white light when a high voltage is applied.
Usually, xenon
flashes are brighter than the LED flashes found in most camera phones. However
they cannot be used as video light and the condenser they use as a power source
needs some time to recharge after each shot.
The
presence of a xenon flash on a mobile phone doesn't necessarily mean a more
powerful flash performance. The power of the xenon flash is dependent on the
size of the condenser used to power it up.