2G (or 2-G) is short for second-generation cellular network. 2G cellular networks were commercially launched on the GSM standard in Finland by Radiolinja (now part of Elisa Oyj) in 1991.
Three primary benefits over their predecessors were:
- Digitally encrypted phone conversations, at least between the mobile phone and the cellular base station but not necessarily in the rest of the network.
- Significantly more efficient use of the radio frequency spectrum enabling more users per frequency band.
- Data services for mobile, starting with SMS text messages.
2G technologies enabled the various networks to provide services such as text messages, picture messages, and MMS (multimedia messages).
After it was launched, the previous mobile wireless network systems were retroactively dubbed 1G. While radio signals on 1G networks are analog, radio signals on 2G networks are digital. Both systems use digital signaling to connect the radio towers (which listen to the devices) to the rest of the mobile system.
With General Packet Radio Service (GPRS), 2G offers a theoretical maximum transfer speed of 40 kbit/s. With EDGE (Enhanced Data Rates for GSM Evolution), there is a theoretical maximum transfer speed of 384 kbit/s.
The most common 2G technology was the time division multiple access (TDMA)-based GSM, originally from Europe but used in most of the world outside Japan and North America. In North America, Digital AMPS (IS-54 and IS-136) and cdmaOne (IS-95) were the main systems. In Japan, the ubiquitously deployed system was Personal Digital Cellular (PDC).
It is understood as GSM and CDMA, has been superseded by newer technologies such as 3G (UMTS / CDMA2000), 4G (LTE) and 5G; however, 2G networks are still used in most parts of Europe, Africa, Central America and South America, and many modern LTE-enabled devices are known to still fallback to 2G for phone calls, especially in rural areas. In some places, its successor 3G is being shut down rather than 2G – Vodafone announced that it will switch off 3G across Europe in 2020 but retain 2G as a fallback service.
Various carriers have made announcements that this technology in the United States, Japan, Australia, and other countries is in the process of being shut down, or have already shut down 2G services so that carriers can reclaim those radio bands and re-purpose them for newer technologies (e.g. 4G LTE).