History about mobile phone

The inventor of the first mobile phone system was Martin Cooper, an employee of Motorola on April 3, 1973, although many called the inventor of a mobile phone was a team of one of Motorola's divisions (the division where Cooper worked) with the first model being DynaTAC. The idea coined by Cooper is a small and flexible traveling mobile device. Cooper and his team face the challenge of incorporating all the electronic materials into the small tool for the first time. But finally a first mobile phone successfully completed with a total weight of two kilograms. To produce it, Motorola costs equivalent to US $ 1 million. In 1983, portable mobile phones cost US $ 4 thousand (US $ 36 million) equivalent to US $ 10 thousand (Rp90 million). Another character who is known to be very meritorious in the world of cellular communication is Amos Joel Jr. who was born in Philadelphia, March 12, 1918, he is recognized as a world expert in the field of switching. He received a bachelor's degree (1940) and master (1942) in electronic engineering from MIT. Not long after the study, he began his career for 43 years (from July 1940-March 1983) at Bell Telephone Laboratories, where he received over 70 US patents in telecommunications, particularly in the field of switching.