ABSTRACT

Mobility brings freedom from being confined. Driven by this idea of freedom, how to make the consumer untangled has always been the focus area for both industry and researchers. Wireless telegraphy used communication without wire more than a century ago. Voice also became wireless at a later stage. Wireless data is in existence since 1979 [1, 2]. However, the challenge was how to make an industry-grade communication wireless service where thousands of people can use it and, above all, the user can move around the world and use the wireless services without any constraint. The global system for mobile communication (GSM) technology solved this challenge for voice communication using the technology of roaming.