If your iPhone's touchscreen is not working, first try to force-restart the phone. Make sure your touchscreen is clean and dry so it can sense your fingertips. Remove cases or screen protectors that may be interfering with the touchscreen.
All iPhones: How to Restart without Power Button (Broken Power Button?)
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How can I restart my phone without using the buttons?
By far the easiest way to restart an Android device without a power button is the Quick Settings panel. This menu has the toggles for Wi-Fi, Bluetooth, Airplane Mode, and many other customizable tiles. Simply swipe down once or twice---depending on your device---and tap the power icon. Select "Restart" from the menu.
Another way to restart an Android phone whose power button isn't working is to use the accessibility settings. Go to Settings > Accessibility and toggle on the Accessibility menu. You'll now see a new shortcut either on your navigation bar or in the bottom right corner of the screen.
How do you reset an unresponsive iPhone touch screen?
Press and quickly release the volume up button. Press and quickly release the volume down button. Press and hold the side button until you see the Apple logo.
A smartphone touchscreen can become unresponsive for several reasons. For example, a brief hiccup in your phone's system could render it unresponsive; a screen may also become unresponsive after incurring water damage. Other factors may include debris, app glitches and viruses.
