To save battery power, your screen turns off if you haven't used it for some time. You can lengthen or shorten the time before your screen automatically turns off.
When you bring the phone to your face to speak into it during calls, the screen turns off to prevent accidental touches. When you pull the phone away from your face, the screen turns on so you can use it. (If the screen stays dark, follow these steps.)
If you use a screen lock, you can set your phone to automatically turn your screen on when:
Your screen will go from being dark to showing your lock screen, where you can easily glance at the time, new notifications, and battery level.
After the screen turns on automatically, if you don’t interact with it for several seconds, it turns off again to save battery.
To turn the screen off:
To turn the screen on: