Conversation so far:
when did cell phones first hit the market
First automatic analog cellular systems deployed were NTT's system first used in Tokyo in 1979, later spreading to the whole of Japan, and NMT in the Nordic countries in 1981.
when did the first cell phones sell in the united states
The first analog cellular system widely deployed in North America was the Advanced Mobile Phone System. It was commercially introduced in the Americas in 13 October 1983.

Question: was the phone system innovative
Self-contained rewrite: was the advanced mobile phone system innovative