EDGE stands for Enhanced Data for Global Evolution.
The EDGE network is an upgrade for GSM networks that will double or triple the data speed rates as compared to satndard GPRS.
EDGE can only be used if both the phone and the network support it. If only the phone supports it but not the network, the phone will revert to the slower GPRS standard.
EDGE phones are capable of up to 236 Kbps but most only hit 135 Kbps.