The prototype was 2.5 pounds and had only enough power for a 20 min call
Forty years ago today, Marty Cooper made the first mobile phone call in history. The prototype was eventually released as a commercial product to the public as the Motorola DynaTAC 8000x. It weighed 2.5 pounds, cost $3,995, and only had enough battery life for 20 minutes of talk time on a single charge. Mashable has the story:
Mashable also has a great graphic showing the history of cell phones.