![]() ![]() The North American Standards IS-54 and IS-136 were also second-generation (2G) mobile phone systems, known as ( Digital AMPS) and used TDMA with three time slots in each 30 kHz channel, supporting 3 digitally compressed calls in the same spectrum as a single analog call in the previous AMPS standard. Second generation 2G cellular telecom networks were commercially launched on the GSM standard in Finland by Radiolinja (now part of Elisa Oyj) in 1991. It has 3 main services: Bearer services is one of them which is also known as data services and communication. 2G technologies enable the various mobile phone networks to provide the services such as text messages, picture messages and MMS (Multimedia Message Service). ![]() 2G (or 2-G) provides three primary benefits over their predecessors: phone conversations are digitally encrypted 2G systems are significantly more efficient on the spectrum allowing for far greater mobile phone penetration levels and 2G introduced data services for mobile, starting with SMS (Short Message Service) plain text-based messages.
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