To force restart your device:

Sometimes you might need to force restart your device. A force restart won’t erase the content on your device. You can force restart your device even if the screen is black or the buttons aren’t responding.

Follow these steps:

On an iPhone XS, XR, X, or iPhone 8: Press and quickly release the Volume Up button. Press and quickly release the Volume Down button. Then, press and hold the Side button until you see the Apple logo. Once the Apple logo appears, release the button.

On an iPhone 7 or iPhone 7 Plus: Press and hold both the Side and Volume Down buttons for at least 10 seconds, until you see the Apple logo. Once the Apple logo appears, release the buttons.

On an iPhone 6s and earlier, iPad, or iPod touch: Press and hold both the Home and the Top (or Side) buttons for at least 10 seconds, until you see the Apple logo. Once the Apple logo appears, release the buttons.

On an Apple Watch: Press and hold both the Digital Crown and the side button until the screen goes blank, and then the Apple Logo appears. Once the Apple logo appears, release the buttons.