Auto-Lock Not Working on iPhone 18 Pro? How to Fix It

The auto-lock feature on your iPhone 18 Pro will automatically lock your iPhone (your device’s touchscreen will lock and its display will dim – sleep mode) after a set period of inactivity unless you disable this feature. Default is one minute.

You will still receive calls and messages while your iPhone 18 Pro is locked.

Some users are complaining about issues with the auto-lock feature. Users are saying that the recent iOS update has caused problems that this feature no longer works, as a result, their devices use more energy cutting into the battery life.

If this feature is not working as expected, meaning if your iPhone 18 Pro does not go into sleep mode after a period of inactivity, you can try the following tips to fix.

Note: You can’t change auto-lock settings when in Low Power Mode. If the options are greyed out this is because your device is in this mode.

To change auto-lock, go to Settings > Display & Brightness > Auto-Lock

Auto Lock Problems; Fix

1. It is possible that Auto-Lock is set to Never. Go to Settings > Display & Brightness > Auto-Lock and set the timer (except Never).
2. Restart your iPhone 18 Pro
3. Turn off Passcode by going to Settings > Face ID & Passcode (you will be asked to enter your passcode) > and tap Turn Passcode Off. Then restart your device and turn Passcode back on.
4. Force restart your device. Press and quickly release the volume up button. Press and quickly release the volume down button. Press and hold the side button. When the Apple logo appears, release the side button.

   

5. Change the auto-lock settings. For instance, if your auto-lock is set to 1 minute, change it to 30 seconds. And check if this makes any difference.
6. Disable AssistiveTouch, if it is enabled. Go to Settings > Accessibility > Touch > AssistiveTouch

Auto-Lock settings greyed out?

If you experience this, it is likely that your device is in Low Power Mode to help save battery life. In Low Power Mode, Auto-Lock is set to 30 seconds. To fix this, simply turn off Low Power Mode by going to Settings > Battery > Power Mode > and toggle off Low Power Mode.

You can easily change the auto-lock settings. Here is how:

How to change the iPhone 18 Pro Auto Lock settings:

Go to Settings > Display & Brightness > Auto-Lock and set the timer.