Born in 1928, Cooper served in the us Navy before taking a degree in Electrical Engineering at Illinois Institute of Technology .His first mobile phone weighed about 1 kilogram or 2.2 pounds. He tested it by calling a rival scientist to announce his success .The Motorola DynaTAC had twenty large buttons, a tong rubber antenna and a talk time of just thirty minutes, before needing to be recharged for 10 hours.