Global Packet Radio Service(GPRS)

         General Packet Radio Service (GPRS) is a packet Switched mobile data service on the 2G and 3G cellular communication system's global system for mobile communications (GSM). GPRS was standardized by European Telecommunications Standards Institute (ETSI) in response to the earlier CDPD and packet-switched cellular technologies. It is now maintained by the 3rd Generation Partnership Project (3GPP). GPRS usage is typically charged based on volume of data transferred, contrasting with circuit switched data, which is usually billed per minute of connection time. Sometimes billing time is broken down to every third of a minute. Usage above the bundle cap is charged per megabyte, speed limited, or disallowed. It is a best service, implying variable throughput and latency that depend on the number of other users sharing the service concurrently, as opposed to circuit switching, where a certain quality of service (QoS) is guaranteed during the connection. In 2G systems, GPRS provides data rates of 56–114 kbit/second. 2G cellular technology combined with GPRS is sometimes described as 2.5G, that is, a technology between the second (2G) and third (3G) generations of mobile telephony.It provides moderate-speed data transfer, by using unused time division multiple access (TDMA) channels in, for example, the GSM system.