what is Mobile device????

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A mobile device is a small, handheld computing device usually outfitted with a display screen and input method (either touchscreen or miniature keyboard) many portable mobile devices have operating system that can run applications ( or "apps"). Apps make it possible for mobile devices and phones to be used as gaming devices, media players, calculator, navigators, and more. Popular operating system and manufacturers include the following -android, Apple (iOS),BlackBerry, Kindle Fire, Palm, Windows Mobile.