- 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 It provides nearly three times faster speeds than the outdated GPRS system.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.
Extended GPRS other name of 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.
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 is capable of slightly faster downlink speeds of 3.1Mbps and significantly faster uplink speeds of 1.8Mbps. Rev. A also 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 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.
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