1G 【First Generation】
1G is a term refers to the first generation of mobile wireless phones. 1G is the generation where the basic analog cellular phones were introduced to the market. 1G technology were introduced in the 80s and continued until being replaced by 2G digital cellular phones.
1G mobile wireless phones used analog radio signals where as 2G networks are digital. The AMPS (Advanced Mobile Phone System) is an example of a 1G cellular system used in the United States.