1G Mobile Network

First generation mobile network that refers to the initial mobile wireless networks using analog technology only and not carrying data. Advanced Mobile Phone Service (AMPS) is an example of a 1G mobile network standard. Although 1G and 2G both use digital signaling to connect radio towers to the rest of the telephone system, the voice itself is encoded to digital signals in 2G whereas 1G is only modulated to higher frequency (~150 Mhz).

Other 1G standards (other than AMPS) are NMT (Nordic Mobile Telephone) which is used in Nordic countries, Eastern Europe and Russia; TACS (Total Access Communications System) used in the United Kingdom and JTAGS used in Japan. Keep in mind that analog cellular service is quickly being phased out in most places worldwide.

Sources: Newton’s Telecom Dictionary 22nd edition, 2006; http://www.javvin.com/wireless/1G.html