Q: What is EDGE?

EDGE (Enhanced Data rate for GSM Evolution) is a specification for data transfer on GSM networks.
EDGE features both a packet capability, EGPRS (Enhanced General Packet Radio Service), and a circuit switched capability, ESCD (Enhanced Circuit Switched Data).
EDGE packs up to 69.2Kbps into eight timeslots, for a total theoretical bandwidth of 473.6Kb. GERAN (GSM/EDGE Radio Access Network) is the name given to the 3GPP standards for GSM/EDGE radio access. EDGE is an update to GPRS.