Open Settings and find Display & Brightness

To change how long your iPhone screen stays on before it locks, open the Settings app from your home screen. Tap Display & Brightness — it's usually near the top of the list, marked with a sun icon.

Once you're in Display & Brightness, look for the option labeled Auto-Lock. This is the setting that controls your screen timeout. Tap it to see your choices.

Choose your screen timeout duration

Your iPhone offers six timeout options: 30 seconds, 1 minute, 2 minutes, 3 minutes, 5 minutes, and 10 minutes. Select whichever duration works best for you. A checkmark appears next to your choice.

Shorter timeouts (30 seconds to 1 minute) save battery but lock your screen faster when you're reading or referencing something. Longer timeouts (5 to 10 minutes) keep your screen on longer but drain the battery more quickly. There is no "never lock" option in Auto-Lock — if you want your screen to stay on indefinitely while plugged in, you'll need to use a different feature (see the FAQ below).

Key Takeaways

  • Auto-Lock is found in Settings > Display & Brightness and controls how many seconds pass before your screen turns off.
  • You can choose from 30 seconds, 1 minute, 2 minutes, 3 minutes, 5 minutes, or 10 minutes.
  • Shorter timeouts save battery life but lock your phone faster when you're actively using it.
  • If you're charging your phone and want the screen to stay on, enable Guided Access or use Developer Mode instead of changing Auto-Lock.

Why your screen locks automatically

Auto-Lock exists for security and battery life. When your iPhone locks, it requires Face ID, Touch ID, or your passcode to unlock — this protects your data if you leave your phone unattended. The timeout also prevents your battery from draining while the screen is on but nobody is using the phone.

If you find yourself constantly unlocking your phone because the timeout is too short, increasing it to 3 or 5 minutes is usually a good middle ground. If battery life is your main concern, keep it at 1 or 2 minutes.

What happens when your screen times out

When the Auto-Lock timer runs out, your screen goes black and your iPhone locks. Any app you were using stays in memory, so when you unlock it again, you'll return to roughly where you left off — you won't lose unsaved work in most cases, though some apps may refresh.

The lock also activates your lock screen, which shows the time, date, and notifications. You'll need to unlock your phone to access anything else. This happens whether your phone is plugged in or running on battery.

Changing timeout for specific situations

If you need your screen to stay on longer for a specific task — like following a recipe or reading a long article — you don't have to change your Auto-Lock setting permanently. Instead, open Control Center (swipe down from the top right on newer iPhones, or up from the bottom on older models) and tap Low Power Mode to turn it off temporarily. This removes the battery concern and lets you focus on your task.

Another option is to use Guided Access, which locks your iPhone into a single app and prevents the screen from timing out. Open Settings > Accessibility > Guided Access, turn it on, then triple-click the side button (or home button on older models) to start Guided Access in any app. Your screen will stay on as long as you're in that app.

Common mistakes and how to avoid them

The most common mistake is confusing Auto-Lock with Sleep/Wake — the physical button on the side of your phone. Pressing the Sleep/Wake button locks your screen when ready, regardless of your Auto-Lock setting. Auto-Lock only controls the automatic timeout.

Another mistake is setting Auto-Lock to 30 seconds if you use your phone for reading or reference. You'll find yourself unlocking constantly. If you use your phone this way regularly, try 2 or 3 minutes instead and see if that feels better. You can always change it back.

Frequently Asked Questions

Can I set my screen to never lock automatically?

No, Auto-Lock does not have a "never" option. The longest timeout is 10 minutes. If you need your screen to stay on indefinitely while you're using your phone, enable Guided Access in the app you're using, or turn off Low Power Mode if battery isn't a concern.

Does changing Auto-Lock affect how long my phone stays on when I'm not using it?

No. Auto-Lock only controls the timeout when your phone is awake. Your iPhone's overall sleep timer (which puts the entire device into a low-power state) is separate and is controlled by your battery settings and usage patterns.

Will a shorter Auto-Lock timeout really save battery?

Yes, but the difference is usually small — a few percent per day depending on how often you use your phone. The screen is one of the biggest battery drains, so locking it sooner does help, especially if you often set your phone down without locking it manually.

What if I set Auto-Lock to 10 minutes and my screen still locks sooner?

Check whether Low Power Mode is on — it overrides Auto-Lock and locks your screen faster to save battery. Also check if you have any accessibility features enabled that might affect screen timeout. If neither of those is the issue, restart your iPhone and try again.

Does Auto-Lock work the same way when my phone is plugged in?

Yes. Auto-Lock applies whether your phone is charging or running on battery. The timeout duration does not change based on power source.