1G

First generation of mobile wireless, which utilizes analog air interface technology. (Cingular)

1G (or 1-G) is short for first-generation wireless telephone technology, cellphones. These are the analog cellphone standards that were introduced in the 80s and continued until being replaced by 2G digital cellphones.

One such standard is NMT (Nordic Mobile Telephone), used in Nordic countries, Eastern Europe and Russia. Others include AMPS (Advanced Mobile Phone System) used in the United States, TACS (Total Access Communications System) in the United Kingdom, C-450 in West Germany, Portugal and South Africa, Radiocom 2000 in France, and RTMI in Italy.

Antecedent to 1G technology is the mobile radio telephone, or 0G. (Wikipedia)