First touchscreen phone
First touchscreen phone was made by IBM Simon in august 1994. To February 1995 IBM sold 50,000 units.
IBM Simon Phone - CHI 2011
How it works?
How it works
The basic idea is pretty simple -- when you place your finger or a stylus on the screen, it changes the state that the device is monitoring. In screens that rely on sound or light waves, your finger physically blocks or reflects some of the waves.