GPRS or General Packet Radio Services
GPRS stands for General Packet Radio Services. It is a type of packet switching technology which makes data transfers possible on mobile networks. Main usage of having GPRS enabled is using mobile internet and MMS. Other kinds of data communication can be utilized on through this GPRS. Theoretically, GPRS has got speed limit of 115 kbps but in most of the networks, the speed is around 35kbps. In informal usage, GPRS is otherwise called as 2.5G.
EGPRS is nothing but a kind of synonym for EDGE or Enhanced Data for Global Evolution.
EDGE or Enhanced Data for Global Evolution
EDGE stands for Enhanced Data for Global Evolution. It is a kind of data system used on GSM networks. It is advanced than GPRS system and it provides nearly three times faster data transfer when compared to the GPRS. Theoretically, maximum speed of EDGE will be 473 kbps per eight timeslots, but practically it is limited to 135 kbps for the purpose of conserving spectrum resources. It can be used only when the mobile handset device and network operator is supporting EDGE. It is sometimes referred to as 2.75G.
APN or Access Point Name
APN is the short form for Access Point Name and it is the name or web address for UMTS/EDGE/GPRS data connection. APN is provided by network operators to the users.
UMTS or Universal Mobile Telecommunications System
Universal Mobile Telecommunications System is otherwise called as UMTS. It is a kind of 3G wireless network allowing speeds of up to 2 Mbps. It is based on WCDMA technology.