General Packet Radio Service (GPRS) is a Mobile Data Service accessible to GSM and IS-136 mobile phones users.
This service is packet-switched and several number of users can divide the same transmission channel for transmitting the data.
This tutorial helps you to understand GPRS Basics and should be your starting point.
This guide/tutorial is prepared for the beginners to help them understand basic to advanced concepts related to GPRS.
Before starting your practice with varied examples given in this reference; I am assuming that you are already aware of basic Telecom terminologies.