After the first arrival in late 1970s, cellular network have evolved significantly in the later years with successive generations like 2G ,3G and many more.

First Generation (1G): First generation mobile network first emerged in Japan in the year 1979. It was based on an analogue technology known as Advanced Mobile Phone System (AMPS), which basically used Frequency Division Multiple Access (FDMA) modulation. First generation mobile networks offered a channel capacity of 30KHz and a speed of 2.4kbps. 1G network allowed only voice calls to be made, which suffered from reliability and signal interference issues and had limited protection against hackers.

Second Generation (2G): In 1991 2G network was introduced. This network offered bandwidths of 30KHz to 200KHz. 2G network was based on digital signalling technology, Global System for Mobile Communication (GSM), which increased security and capacity. 2G networks allowed users to send SMS and MMS messages at low speeds up to 64kbps. Due to continuous improvement of GSM technology led to the introduction of so-called 2.5G, which incorporated packet switching in the form of GPRS and also EDGE technology. 2.5G enabled data-rates up to 144kbps, enabling users to send and receive e-mail messages and browse the web.

Third Generation (3G): 3G networks arrived in the year 2000 and was known as UMTS in Europe and CDMA2000 in the USA. 3G made a big change in the way mobile phones were used and viewed by the end user, becoming less about voice calls, more about social connectivity. Based on GSM the main aim of 3G was to support high-speed data and the original 3G technology allowed data-rates up to 14Mbps. Because of its ability to transmit greater amounts of data at higher speeds, 3G enabled users to make video calls, surf the web, share files, play online games and even watch TV online.