If your iPhone isn’t responding and you can’t get it to switch off or on, try to reset it. The procedures for forcing an iPhone restart vary depending on the model.
Hard reset an iPhone with Face ID
Follow these steps to forcibly restart your iPhone X, iPhone XS, iPhone XR, iPhone 11, iPhone 12, or iPhone 13:
Press and fast release the volume up and down buttons, then press and hold the side button. Release the button when the Apple logo displays.
Hard restart your iPhone 8 or iPhone SE(2nd generation)
Press and fast release the volume up and down buttons, then press and hold the side button. Release the button when the Apple logo displays.
Hard restart your iPhone 7
At the same moment, press and hold the volume down and the Sleep/Wake buttons. Release both buttons when the Apple logo displays.
Hard restart your iPhone 6s or iPhone SE(1st generation)
At the same moment, press and hold the Sleep/Wake button and the Home button. Release both buttons when the Apple logo displays.