Unresponsive Screen
Why does the screen on my iPhone 11 become unresponsive during calls?
iPhone 11, iOS 13
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Restart your device. Make sure 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.
If the screen isn't working on your iPhone or iPad - Apple ...