Apple iPhone 4S features Dual-core A5 chip. 8 megapixel camera and optics. iOS5, iCloud and Siri. LED-backlit IPS TFT and capacitive touchscreen in the Apple iPhone 4S White. With the injection of 16 million colors of 640x960 pixels, the 3.5-inches measuring screen of this gadget has a pixel density of 330 ppi. The screen is guarded by the Scratch-resistant oleophobic surface that renders clarity to the charming Apple iPhone 4S White. The touch screen functions are accentuated by the Multi-touch input method, auto-rotate, three-axis gyro and proximity sensor or auto turn-off sensors.