It is forecasted that cellular systems using digital technology will become the universal method of telecommunications. This book describes and explains the rapid advances in Global System for Mobil Communication (GSM). It provides coverage of the basics of GSM, as well as an introduction to advanced GSM concepts, specifications, networks, and services. It serves as a valuable resource for senior-level network engineers, network managers, data communication consultants, IT professionals, equipment providers, carrier and service provider personnel, system engineers, and consultants.