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1G (or 1-G) is short for first-generation wireless telephone technology, cellphones. These are the analog cellphone standards that were introduced in the 80's 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. Another is AMPS (Advanced Mobile Phone System) used in the United States.
Anticedant to 1G technology is the mobile radio telephone, or 0G.
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