Also known as: First Generation
1G (First Generation) is the name given to the first generation of mobile telephone networks. These systems used analogue circuit-switched technology, with FDMA (Frequency Division Multiple Access), and worked mainly in the 800-900 MHz frequency bands. The networks had a low traffic capacity, unreliable handover, poor voice quality, and poor security.
As the 1G networks became obsolete, their frequencies were auctioned off for use in 2G and 3G networks. Examples of these first generation mobile phone networks are AMPS (Advanced Mobile Phone Service), TACS/ETACS (Total Access Communications System / Extended Total Access Communications System), NMT 450 (Nordic Mobile Telephone System) and NTT (Nippon Telegraph and Telephone System).