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Mobile phone is just a telecommunication device, that can make call and receive call over a radio frequency link while the user is moving within a telephone network service area. In present time mobile not just a telephone this is a small portable computer. Structural classification of mobile phone : * Bar Phone * Touchscreen Phone * Smart Phone * Tablet phone Network base classification of mobile phone : * GPRS mobile phone * 2G mobile phone * 3G mobile phone * 4G mobile phone OS base classification of mobile phone : Many type os is present in market. But some os is popular. * Java mobile . * Windows mobile . * Android mobile . * Blackberry mobile . - etc. History of mobile: The first mobile phone is not a mobile phone that is two way radio. That is use only emergency services. That is not public mobile phone.  Motorola employee Martin Cooper is first invented public mobile phone (1973). Early mobile phone is 0G mobile phone. The f...

Computer is a device for store data, processing data, calculate and operation according to user instruction. Types of computer : 1. Super computer 2. Mainframe computer 3. Mini computer 4. Micro computer History of computer : World first calculating device is abacus. That's found in China. Abacus is counting frame. That is mechanical device use to calculate and counting. In 19th century professor Charles Babbage designed analytical engine, that is base of modern computer. He is inventor of first computer. Lady Ada Lovelace is first programmer. First electronic digital computer built by Dr. John v. Atanasoff and Clifford Berry. It was called atanasoff-berry computer (ABC). Because of the hard work of many people we can see the present computer.