The competing mobile phone technology, CDMA (Code Division Multiple Access) is used by Sprint, Verizon, and US Cellular. This is why many AT&T phones do not work with Verizon service and vice versa.
The EDGE Advancement
EDGE is a faster version of GSM—a high-speed 3G technology that was built to the GSM standard. EDGE networks were designed to deliver multimedia applications such as streaming television, audio, and video to mobile phones at speeds of up to 384 Kbps. Although EDGE is three times as fast as GSM, its speed still pales in comparison to standard DSL and high-speed cable internet. The EDGE standard was first launched in the United States in 2003 by Cingular, which is now AT&T, and meant to expand upon the GSM standard. AT&T, T-Mobile, and Rogers Wireless in Canada all use EDGE networks. Other names for EDGE technology include IMT Single Carrier (IMT-SC), Enhanced GPRS (EGPRS), and Enhanced Data Rates for Global Evolution.
EDGE Usage and Evolution
The original iPhone, which launched in 2007, is an example of an EDGE-compatible phone. Since that release, an enhanced version of EDGE has been developed. Evolved EDGE is more than twice as fast as original EDGE technology.
