2G and 3G technologies denote the second and third generation technologies used in wireless communication. In modern world increasing demand for communication has resulted in several standards for mobile communication. Among them 2G and 3G are dominant standards which revolutionize the mobile communication industry in past few years. Both standards emphasize on various targets and as a result various technologies have been introduced. 2G (GSM) Technology Global System for Mobile communication is also known as 2G which is the first step towards the digital wireless communication over existing analog mobile communication prevailing. Technology standard was first introduced in 1991 and from that onwards number of subscribers has grown over 200 million during 1998. In this technology for the first time SIM (Subscriber Identity Module) is introduced and a more secured and clear communication was established. This has been widely adopted all over the world and curren...
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