Iphone11 touchscreen doesn't work
Touchscreen doesn't respond
iPhone 11, iOS 16
First, try a forced restart, if that doesn't work make an appointment at the Genius Bar to have it diagnosed.
• Press and quickly release the volume up button
• Press and quickly release the volume down button
• Press and hold the side button.
• When the Apple logo appears, release the button.
Force restart iPhone - Apple Support (IN)
Genius Bar Reservation and Apple Support Options - Apple