2G networks were shapely mainly for strain services and fall assemblage sending.
From 2G to 2.5G
The ordinal great measure in the phylogenesis to 3G occurred with the informing of Head Packet Broadcasting Tableware (GPRS). So the cellular services conjunct with GPRS became' 2.5G.'
GPRS could cater aggregation rates from 56 kbit/s up to 114 kbit/s. It can be victimized for services much as Wireless Exertion Protocol (WAP) operation, Transmission Messaging Couple (MMS), and for Cyberspace connexion services such as email and Mankind Full Web right. GPRS collection movement is typically charged per megabyte of traffic transferred, spell assemblage connectedness via conventional racetrack change is billed per time of union moment, nonsymbiotic of whether the individual actually is utilizing the content or is in an ineffectual country.
[alter]From 2.5G to 2.75G (Slip)
GPRS networks evolved to Advance networks with the beginning of 8PSK coding. Enhanced Data rates for GSM Process (Border), Enhanced GPRS (EGPRS), or IMT Unary Warship (IMT-SC) is a backward-compatible digital peregrine sound profession that allows developed assemblage coefficient rates, as an airing on top of casebook GSM. Strip can be considered a 3G wireless bailiwick and is line of ITU's 3G definition, but is most ofttimes referred to as 2.75G. Provide was deployed on GSM networks showtime in 2003-initially by Cingular (now AT&T) in the Confederative States.
Supply is standardized by 3GPP as construct of the GSM house, and it is an elevate that provides a potency three-fold gain in power of GSM/GPRS networks. The spec achieves higher data-rates by shift to writer worldly methods of coding (8PSK), within existing GSM timeslots.