However, force restarting your iPhone is necessary if it becomes completely unresponsive, as you need to use the touch screen to perform a regular reboot.

Remove the screen protector carefully and clean the iPhone’s screen with a soft, lint-free cloth to ensure there are no obstructions or debris affecting the touchscreen.

How to Fix a Touch Screen That Isn't Working We've found that the following steps can help a touch screen start working again. You should try them in this order, but some may not apply to your device.