What auto-lock does and why you'd change it

Auto-lock is the setting that makes your iPhone screen go dark after a certain amount of time when you're not using it. By default, most iPhones lock after 30 seconds of inactivity. You change this setting when you want the screen to stay on longer — for example, if you're reading a recipe while cooking and don't want to keep tapping the screen — or when you want it to lock faster for security reasons.

The auto-lock timer only counts time when you're not touching the phone. If you're actively using it, the screen stays on no matter what the setting is. Once the timer runs out and the screen locks, you'll need to use Face ID, Touch ID, or your passcode to unlock it again.

Changing auto-lock is one of the most common adjustments people make to their iPhone, and it takes about 30 seconds. The setting lives in the same place across all recent iPhone models.

Key Takeaways

  • Auto-lock is the feature that darkens your screen after you stop using your iPhone, and the default time is usually 30 seconds.
  • You change auto-lock by opening Settings, tapping Display & Brightness, then selecting Lock Screen, and choosing your preferred time interval.
  • Your options range from 30 seconds up to 5 minutes, or you can turn auto-lock off entirely — though turning it off drains your battery faster.
  • The auto-lock timer only counts when you're not touching the phone; active use keeps the screen on regardless of the setting.

Opening Settings and finding the right menu

Start by opening the Settings app on your home screen — it's the gray icon with white gears. Once it opens, look at the second item in the list, which should say "Display & Brightness." Tap that option.

Inside Display & Brightness, scroll down until you see "Lock Screen" written in blue text. This is the section that controls what happens when your phone locks. Tap "Lock Screen" to open it.

Selecting your auto-lock time

Once you're in the Lock Screen menu, you'll see a section labeled "Auto-Lock" near the top. Below that label are several time options: 30 Seconds, 1 Minute, 2 Minutes, 3 Minutes, 4 Minutes, 5 Minutes, and Never.

Tap whichever time you prefer. A checkmark will appear next to your choice, and the setting takes effect when ready — you don't need to save or confirm anything. If you want to verify the change worked, lock your phone by pressing the side button and wait to see if the screen goes dark at your chosen interval.

Understanding the Never option and battery impact

The "Never" option turns off auto-lock completely, meaning your screen will stay on as long as your phone has power. This is useful if you're using your iPhone as a display — for example, propped up while video calling — but it drains your battery much faster than any timed option.

If you choose "Never," your phone will only lock when you manually lock it by pressing the side button or when your iPhone goes to sleep mode (which is a separate setting). Most people should avoid "Never" for daily use and instead pick a time between 1 and 5 minutes that matches their habits.

Why your auto-lock setting might not be working

If you've changed the auto-lock time but your screen still locks faster than expected, check whether you have an accessibility feature called "Guided Access" turned on. Guided Access can override auto-lock settings. To check, go to Settings, tap Accessibility, then Guided Access, and make sure the toggle is off.

Another reason your screen might lock unexpectedly is if you have "Low Power Mode" turned on. Low Power Mode can shorten auto-lock to save battery. You can turn it off by going to Settings, tapping Battery, and toggling off Low Power Mode.

Changing auto-lock for specific apps

Your auto-lock setting applies to your entire phone — you can't set different auto-lock times for different apps. However, some apps like Apple Books or Apple Maps have their own internal settings that keep the screen on while you're using them, regardless of your auto-lock setting.

If you're using an app and the screen keeps locking when you don't want it to, the app itself may have a "keep screen on" option in its settings. Check the app's menu or preferences to see if that option exists.

Frequently Asked Questions

Can I set auto-lock to a time shorter than 30 seconds?

No. The shortest auto-lock option available on any iPhone is 30 seconds. If you need your phone to lock faster, your only option is to manually lock it by pressing the side button whenever you want the screen to go dark.

Does auto-lock use more battery if I set it to a longer time?

Yes. The longer your screen stays on, the more battery it uses. If battery life is a concern, keep auto-lock set to 30 seconds or 1 minute. Longer times like 5 minutes will noticeably reduce how long your phone lasts between charges.

What happens to auto-lock when I update my iPhone?

Your auto-lock setting is preserved when you update your iPhone's software. You won't need to change it again unless you want to adjust it to something different.

Does auto-lock lock my phone or just turn off the screen?

Auto-lock both turns off the screen and locks your phone. Once the timer runs out, your iPhone is fully locked and requires Face ID, Touch ID, or your passcode to unlock it.