Functions and features

In addition to working to make and receive phone calls, the phone also has the functions typically sending and receiving short messages (short message service, SMS). There is also a provider of mobile phone services in some countries that provide third generation (3G) services by adding videophone, as a means of payment, as well as for online television on their mobile phones. Now, cell phones become multifunctional gadgets. Following the development of digital technology, now the phone also comes with a wide selection of features, like being able to catch the broadcast radio and television, software audio player (MP3) and video, digital camera, game, and internet services (WAP, GPRS, 3G). In addition to these features, the phone is now embedded computer features. So on the phone, people can change the function of the phone is a mini computer. In the business world, this feature is very helpful for the businessman to do all the work in one place and makes the job completed in a short time.

history of mobile phones

The inventor of the first mobile phone system is Martin Cooper, a Motorola employee on 03 April 1973, although widely touted inventor cell phone is a team of one division of Motorola (division where Cooper worked) with the first model is the DynaTAC. The idea of ​​the type proposed by Cooper is a communication tool that is small and easy to carry travel flexibly.

Cooper and his team faced the challenge of how to include all electronic material into a small device for the first time. But finally a first cell phone was successfully completed with a total weight of weighing two kilograms. To produce it, Motorola will cost the equivalent of U.S. $ 1 million. "In 1983, portable phones worth U.S. $ 4 thousand (Rp36 million), equivalent to U.S. $ 10 thousand (Rp90 million).
Having succeeded in producing mobile phones, the next biggest challenge is adapting infrastructure to support mobile communication systems by creating a network system that only requires 3 MHz spectrum, the equivalent of five TV channels are channeled to the rest of the world.

Another character that is known to be instrumental in the mobile communications world is Amos Joel Jr. who was born in Philadelphia, March 12, 1918, he was recognized worldwide as an expert in the field of switching. He received a bachelor diploma (1940) and master's (1942) in electrical engineering from MIT. Not long after the study, he began his career over 43 years (from July 1940-March 1983) at the Bell Telephone Laboratories, where he received more than 70 U.S. patents in the field of telecommunications, particularly in switching. Amos E Joel Jr., making the system connector (switching) from one region of the cell phone to another cell area. Switching it should work when mobile users move or move from one cell to another so that the conversation is not interrupted. Since the discovery of Joel Amos is a convenient mobile use.

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