World's First Smart phone

IBM Simon with charging base

The first smart phone  combined the function of a personal digital assistant (PDA) with a mobile phone. Later models added the functionality of the portable media players, low-end compact digital cameras, pocket video cameras and GPS navigation units to form one multi-use device.

 A PDA also known as palmtop computer or personal data assistant is a mobile device that functions as a personal information manager.
 The first cellular phone to incorporate PDA features was an IBM prototype developed in 1992 and demonstrated  same year at the COMDEX computer industry trade show.

A refined version of the product was marketed  on 16 Aug.1994 by BellSouth under the name Simon Personal Communicator. The Simon was the first device that can be properly referred to as a "smartphone". In addition to its ability to make and receive cellular