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Chapter 25
Cell Phone Protocols
andOperating Systems
*
Eamon P. Doherty
e cell phone originally was a simple telecommunication device that was only used to make calls.
e operating system was originally an embedded system with a simple interface that allowed
people to conveniently operate the hardware, namely the phone’s keypad, to make or receive calls.
From the time the cell phone was invented until the early 1990s, it was only for making and
receiving calls. Phones such as the Motorola D520 that was announced in 1998 were part of a
widely accepted trend of new cell phones that allowed for SMS messages. e operating systems
had to become ...