How multitouch on your smartphone work? Here are the factors that could affect it.
1. Sensor contained on the screen (Hardware)
Sensors on the touch screen greatly affect the number who were detected, one can detect two touch points, four points touch, or even 10 touch points simultaneously. Almost all sophisticated Android smartphone supports multi-touch up to 10 touch points.
2. Operating system firmware factor (Software)
firmware factors affect the number of touches reply can be detected by the screen. For example Eclair Android OS does not support multi touch device, but when upgraded to version Froyo the device so it can detect the two touch.