GPRS: refers to a service on the 2G network that provides basic data up to 56kbps (similar to dial-up speeds) EDGE: It is a 2.5G technology. An enhancement of the 2G technology which provides higher data transfer rates compared to GPRS (the default on 2G).The speeds can go up to 144 Kbps 3G: 3G technology provides faster / higher data transfer rates compared to the 2G network (EDGE & GPRS).This technology can offer speeds up to 21 Mbps 4G: This technology rides on LTE platform and is the latest in the world of mobile data transfer. It is the next generation of mobile communications. Currently it is the most advanced technology available. Theoretical data downlink speeds can go upto 100 Mbps.
