At first to provide the wireless broadband service the technology calledGPRS(Global Packet Radio Service) or EDGE (Enhanced Data Rate for GSMRevolution).This technology was 2.5 G.The data rate was limited to very lowdata rate in this technology.The data rate in EDGE and GPRS was only about 128kbps.
Then came 3G technology to provide high data rate and to support videocalling in GSM.This is basically UMTS and which is of two types HSPDA andHSPA.Data Rate is high in HSPA than HSPDA.HSPA can send upto 21-45 Mbps data.
After that 4G came and WiMax is supported in this 4G technology.After WiMaxLTE (Long Term Evolution) is now successfully launched.
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