1G

1G refers to the first generation of. These are the telecommunications standards that were introduced in the 1980s and continued until being replaced by 2G  in the 1990s. The main difference between 1G and 2G mobile cellular systems is that the radio signals used by 1G networks are analog, while 2G networks are digital.

Although both systems use digital signaling to connect the radio towers (which listen to the handsets) to the rest of the telephone system, the voice itself during a call is encoded to digital signals in 2G whereas 1G is only to higher frequency, typically 150 MHz and up. The inherent advantages of digital technology over that of analog meant that 2G and later networks eventually replaced them everywhere. The predecessor to 1G technology is the, retroactively referred to as "0G".

Deployment
One such standard is (NMT), used in, Switzerland, the Netherlands,  and Russia. Others include (AMPS) used in North America and Australia,  (Total Access Communications System) in the United Kingdom,  in  Germany, Portugal and South Africa,  in France, TMA in Spain, and  in Italy. In Japan there were multiple systems. Three standards, TZ-801, TZ-802, and TZ-803 were developed by NTT while a competing system operated by Daini Denden Planning, Inc.  used the Japan Total Access Communications System (JTACS) standard.

Apple never shipped a phone for the 1G standard as the first iPhone started with support for GPRS and EDGE, based on advanced versions of the 2G standard.