Auto-Lock controls how long an iPhone waits before turning off and locking the display when you are not using it. A shorter interval can reduce battery use and exposure of an unattended screen, while a longer interval can be more convenient when you are reading or following instructions.
How to Change Auto-Lock on iPhone
- Open Settings.
- Tap Display & Brightness.
- Tap Auto-Lock.
- Select the amount of time you want the iPhone to wait before locking.
The available choices can vary with the iPhone’s configuration and current power settings.
Why Is Auto-Lock Grayed Out?
Low Power Mode can restrict Auto-Lock behavior. If you cannot choose the interval you want, check Settings > Battery and temporarily turn off Low Power Mode. Work or school management policies can also limit display-lock settings.
Should You Choose Never?
If your iPhone offers a Never option, remember that leaving the display awake can use more battery and can leave information visible when you put the phone down. A timed lock is usually safer for a phone that travels with you.
Summary
Go to Settings > Display & Brightness > Auto-Lock and choose the delay you prefer. If the setting is restricted, check Low Power Mode and any device-management requirements.