Enhanced Data rates for GSM Evolution (EDGE) is latest mobile technology which is a further enhancement to existing GSM networks and allows improved data transmission rates. This new mobile technology provides up to three times the data capacity of GPRS so it is also known as EGPRS (Enhanced GPRS). EDGE can be considered a 3G radio technology. BY Using EDGE, operators can handle three times more subscribers than GPRS, triple their data rate per subscriber, or add extra capacity to their voice communications. Also, EDGE allows the delivery of advanced mobile services such as the downloading of video and music clips, multimedia messaging, high-speed Internet access and e-mail on the move. EDGE/ EGPRS is a superset to GPRS and can function on any network with GPRS deployed on it, provided the carrier implements the necessary upgrade. EDGE uses the same structure, as today's GSM networks, which allows it to be overlaid directly onto an existing GSM network. For many existing GSM/ GPRS networks, EDGE is a simple software-upgrade. There is no software and hardware changes in existing GSM networks for EDGE. In addition to Gaussian minimum-shift keying (GMSK), EDGE uses higher-order PSK/8 phase shift keying (8PSK) which triples the gross data rate offered by GSM. EDGE can carry data speeds up to 236.8 kbit/s. Due to the very small incremental cost of including EDGE capability in GSM network deployment, virtually all new GSM infrastructure deployments are also EDGE capable and nearly all new mid- to high-level GSM devices also include EDGE radio technology.