EDGE or Enhanced Data Rates for GSM Evolution is an improvement of GPRS for data transmission. It works on existing GSM networks. It is an extension of GPRS and allows speeds up to 48 KB/s). EDGE is also called 2.75G because the speed is between GPRS (2.5G) and UMTS (3G). 2G and 3G networks are still offered within the M2M service.