If the screen isn't working on your iPhone or iPad
You may need to set up a service for your device.
If your screen is too sensitive or responds intermittently to touch
Make sure that your screen is clean and free of any debris or water.
Disconnect any Lightning or USB-C accessories. If your screen works after removing an accessory, try using a different outlet, cable or charger.
Remove any cases or screen protectors.
Contact Apple Support
If your screen still isn’t working, you may need to set up a service for your device. Contact Apple Support.