"Smart phones differ from ordinary mobile phones in... how they are built and what they can do."
David Wood, Symbian
There is no standard definition for a smart phone, but in its basic sense it is a mobile phone with advanced functions. The first—called "Simon"—was developed by IBM in 1992 and released to the public in 1993. Simon's features included a calendar, an address book, a calculator, a notepad, e-mail, and fax capabilities. Instead of buttons for dialing, it had a touch screen for browsing and an on-screen keyboard for text input.
In 1996 Nokia released its first smart phone, which combined their best-selling phone with the successful, but very expensive, palmtop computer developed by Hewlett-Packard. Later, several operating systems were developed specifically for smart phones, now a requirement for some smart phone definitions.
The most widely used smart phone operating System is Symbian, which in 2005 accounted for 56 more...