With how fast things change these days, it seems funny that we saw mobile phones so heavy they will strain arm muscles.
In fact, the first mobile phone weighed almost 1 kilo (2 lbs.)! It only worked for 30 minutes, and then you had to recharge it again. But people lined up to get their hands on it when it unveiled in 1984, much like lining up for iPhones these days.
In 1972, Martin Cooper and Rudy Krolopp worked on the Motorola DynaTAC 8000X. During the time, nobody thought it was possible to make portables phones but the they were able to come up with a prototyoe in just 6 weeks.
We had to wait another 10 years and $100 million before it became a reality in 1983, because the team had to wait for the mobile phone towers to be constructed.