ABSTRACT
The cell phone originally was a simple telecommunication device that was only used to make calls. The 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. The operating systems had to become more complex as consumers now wished to synchronize their computers and their cell phones to update large phone books with points of contacts for both calling and sending SMS messages.
