Martin Cooper was the first who invented the cell phone in 1973. On April 3, 1973 Martin Cooper made a first call with worlds first cell phone DynaTAC 8000x. He was standing in midtown Manhattan, New York Hilton and could talk about 20 minutes before battery would require recharging. But the problem was that DynaTAC 8000x weighed 1.1kg and was 25cm long. It was hard to hold it for 20 minutes. But this phone was 4 times improved before he reach the market in 1983 and weighed half its origin weight and was half its origin size.