iOS 15.4 lets you unlock your iPhone's Face ID even when wearing a mask — here's how to set it up

To set up Face ID with your mask, update to iOS 15.4, then head to the Settings app and tap "Face ID & Passcode." ...

What to do when your iPhone won't turn off

If your iPhone won't turn off the usual way, you can force restart it with a button combination specific to your iPhone model.