- 1G (The First Generation) It is a wireless telephone technology and mobile telecommunication introduced in 1980s. 1G networks use analog signals as opposed to digital signals used by all the successive generations.
- 2G (The Second Generation) It was commercially launched for the GSM (Global System For Mobile Communication) standard in 1991 by Radiolinja in Finland. It was allowed for enhanced data services and also introduced the Short Messaging Services (SMSs).
- 3G (The Third Generation) It was introduced by NTT DoCoMo in Japan in 2001. Its data transfer rates are 384 K bites/sec to 2 M bites/sec. So, it allows for never before services like video calls, video conferencing, mobile, TV etc.
- 4G (The Fourth Generation) TeliaSonera was the first operator in the world to commercially launch 4G in late 2009. Bharti Airtel Launched India's first 4G service using TDLTE (Time Division Long Term Evolution) technology in Kolkata on 10th April, 2012.
- 5G The Fifth Generation) It was be a successor for 4G. It is a term used in some research papers and projects to denote the next major phase.
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