Make Sure Auto-Lock Is Turned On

Auto-Lock is a setting that will automatically lock your iPhone and put it into sleep mode.

1. Open the Settings app.
2. Tap Display & Brightness.
3. Tap Auto-Lock.
4. The amount of time you select here will determine how long it takes before your iPhone automatically locks itself.
5. Make sure Never is not the option you have selected on this menu.

Why this works:

If Auto-Lock is set to never, your iPhone’s battery will drain significantly faster because the display will always be on.

Pro tip:

• Your iPhone won’t automatically lock as long as you are actively using it!