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 side button.
Step 1: Visit www.iCloud.com, and log in with your Apple ID. Step 2: Click Find My iPhone > All Devices. Step 3: Select the screen-broken iPhone, and select Erase iPhone. This would perform a factory reset on the device.
Restart your iPhone or iPad. 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.
There are mainly two reasons for your phone and tablet touch screen not working. Either the touch screen might have been damaged, or the device has technical issues. If you drop your phone and get stuck against any object, the touch screen's connectivity can get damaged.