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

If your iPhone is showing a black screen that never goes away, you should try resetting it or putting it into recovery mode.

Annoyed with your iPhone's screen turning off while you're reading something on the display? You can turn off the Auto-Lock feature with a few quick taps.

To prevent your iPhone's screen from automatically turning off, open Settings, go to Display & Brightness, and select "Never" from Auto-Lock. Disabling the auto-lock feature reduces battery life and ...