GPRS

GPRS or General Packet Radio Service is a method, in the course of which 2G phones are developed to facilitate them to send and receive data at a great speed. With this GPRS connection, the phone is always on and can transfer data typically at a speed of 32-48 kbps without any delay. Moreover, the added advantage is that the data can be transferred at the same time while making a voice call. GPRS is part of a series of technologies that are intended to move 2G networks nearer to the performance of 3G networks. This speed at which data is transferred is determined by the class of a GPRS phone. Technically the class refers to the number of timeslots available for upload (sending data from the phone) or downloads (receiving data from the network). The timeslots used for data are in addition to the slot that is reserved for voice calls. These timeslots are available concurrently, therefore the greater the number of slots, the faster the data transfer speed. GPRS transmits data in packet and therefore the timeslots are shared amongst all users of the network instead of making use of them all the time which in turn increases the overall data capacity of the network. The bill for using this technology depends on the quantity of data transmitted and not on the time of being online.

Edge

EDGE, or “Enhanced Data for GSM Evolution”, is a technology which is faster and is a wireless service designed by Global System for Mobile (GSM) in order to deliver data at rates up to 384Kbps and make possible the delivery of multimedia along with other multimedia broadband applications to mobile phone and computer users. The EDGE standard is built on the existing GSM standard, using the same time-division multiple access (TDMA) frame structure and existing cell arrangements. The base stations can be updated with software. It was first marketed in 2001. EDGE is actively supported by GSM operators in North America. Some GSM operators elsewhere viewed UMTS as the ultimate upgrade path and either planned to skip EDGE altogether or use it outside the UMTS coverage area. However, the high cost and slow uptake of UMTS have resulted in fairly common support for EDGE in the global GSM/GPRS market. EDGE uses higher-order PSK/8 phase shift keying (8PSK) for the upper five of its nine modulation and coding schemes. EDGE produces a 3-bit word for every change in carrier phase. This triples the gross data rate offered by GSM which means operators can handle three times more subscribers than GPRS; triple their data rate per subscriber. There are various American companies that have EDGE networks in operation, for example AT&T Mobility, Centennial Wireless, Cincinnati Bell and many more. In simple words, it is just a software upgrade for many existing gprs/gsm users.