Date Added: Oct 2012
In this paper, the authors discuss the evolution of the mobile communication systems from GSM to LTE (2G to 4G) and the trends in the mobile communication industry. The Global System for Mobile Communication (GSM) is a well established cellular system targeted here due to its engineering success and the large number of users currently using the services. The flexibility of wireless networks over voice and data transmission makes it one of the most popular modes of communication. Evolution to next generation services depends on an addition of new services and new features to the existing networks or even an integration of different communication technologies.