1, sometimes the touch screen failure is caused by too much dust on the screen. Find a lens wipe to clear the iPhone screen.
2, sometimes after applying hand cream, immediately use the touch screen, which may also lead to screen failure or hands wet, so try to keep dry hands when using the mobile phone.
3, if you buy a very low plastic protective film or film, please replace it with a better quality mobile phone film.
4, if it is not caused by the above reasons, please try to turn off the device and then turn it back on.
5, if you can not shut down, then hold down the phone's Home button and power button at the same time to restart the phone, you can restore the touch screen operation.
6, sometimes the ineffective touch screen is also related to the ios system, please upgrade the ios system to the latest version. The touch screen function will be restored after upgrading to the latest version of iOS.
This is because of the poor contact caused by the Apple phone screen uncle, it is recommended to re-check the understanding of the screen wiring.