IBM Simon
The IBM Simon Personal Communicator (simply known as IBM Simon) is a cellular phone and personal digital assistant (PDA) designed by International Business Machines (IBM), released in 1994. Built on an x86 processor, the IBM Simon features a 4.5 inch resistive touchscreen display and runs an MS-DOS-compatible operating system with the ability to install additional software using its PCMCIA slot, The Simon also has a modem for faxing and email and was also the first PDA to make phone calls through a cellular network; due to these features and capabilities, it has retrospectively been referred to as the first true smartphone.