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evolution of mobile devices
motorola was the first company in 1973. Since then mobile devices have acceled hugely -
Pagers
Numeric Pagers contain a numeric LCD display capable of displaying the calling phone number or other numeric information generally up to 10 digits. The display can also convey pager codes, a set of number codes corresponding to mutually understood pre-defined messages. Pagers were the 1990 generation of mobile devices to get in contact with each other.