Call Barring - A feature that allows a wireless subscriber to block outgoing and incoming calls to and from a specific number or group of numbers.
Call Forwarding - A feature that allows a wireless subscriber to automatically forward incoming call to another number. A wireless subscriber can, for example, forward incoming calls to a landline or another wireless phone.
Call Holding - A feature allowing a wireless user to put a call on hold while they make or receive another call.
Call Transfer - Enables a call to be transferred to another number.
Call Waiting - A feature that allows a wireless subscriber to be alerted to and answer a call even if they are already on another call.
Caller ID - A feature that displays the name and/or number of a caller.
Carrier - A term used to refer to the companies that operate wireless networks and sell use of those networks. The four biggest carriers in the United States are Verizon Wireless, AT&T, Sprint, and T-Mobile.
Coverage Area - The geographic area in which a carrier's wireless services are purported to operate. Coverage areas may be limited to specific services. For example, a specific geographical region may provide reliable 2G digital services but not high-speed 3G services.
Digital Zoom - The zoom effect on some device's cameras that give the appearance of traditional optical zoom, but uses software to modify the field of view. Effectively cropping the image in the device's viewfinder.
Dual-Band - Refers to any device that is able to operate using two different frequency bands. Allows mobile devices to connect to wireless networks employing varying frequencies, often enabling a phone to operate in different areas or countries.
Dual-Mode - Refers to a device that is able to connect to a wireless network using digital or analog technology. Also refers to a device that supports both 2G and 3G wireless technologies.
EMS - See 'Picture Messaging.'
Encryption - The process used to prevent a third-party from deciphering wireless data or voice transmissions. There are varying levels of encryption that in turn allow for varying levels of data security.
Enhanced 911 (E-911) - A feature of newer wireless devices that allows a 911 operator to determine the physical location of a 911 caller.
Enhanced Data for GSM Evolution (EDGE) - An enhancement for GPRS and GSM wireless networks that triples data transmission rates.
Exchange - Microsoft Exchange Server is a server used by many companies and organizations to provide access to messaging and collaborative software. Some mobile devices allow for synchronization with an Exchange server, providing mobile access to email, calendaring, contacts and other data.
Federal Communications Commission (FCC) - The United States government agency tasked with regulating interstate and international communications.
Flash Memory - A rewritable memory storage solution that is capable of retaining data without a power supply.
General Packet Radio Service (GPRS) - The component of a GSM network that provides high-speed packet data service, supplying the means for the transmission of non-voice data communications.
Gigabite - A unit of information equal to 1000 megabytes.
Global Positioning System (GPS) - A navigation tool that employs a network of satellites to pinpoint a user's physical location.
Global System for Mobile Communications (GSM) - The world's most prevalent standard for digital cellular communications.
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