When the touch operation to restart your phone "Volume Down + Home + Power" buttons at the same time. Continue to hold the button until the screen turns off your phone.

iPhone reset

Your device will reboot after the screen turns off. "Volume Down + Home" shortcut keys you can turn off the display, but the display in menüsünü process will fail because you can not move. If after this process works, you can try the following procedure.
If your device has a case or screen protector, try removing it.
Screen with a soft, lightly dampened, clean it with a lint-free cloth.
Remove your device from the wall socket.
Restart your phone.

iPhone, you can try to configure the touch sensitivity settings for 6 and later versions. Settings / General / Accessibility / 3D can configure the touch sensitivity settings by entering the settings. iPhone reset key combination.