iPhone updates arrive automatically, but you control when they install

Your iPhone can download the latest update in the background without you doing anything. When it's ready, you'll see a notification asking you to install it — usually overnight when your phone is plugged in and on Wi-Fi. You can install it immediately, delay it for a few days, or turn off automatic installation entirely and update manually whenever you choose.

The choice depends on your situation. If your phone is new or you use it for work, you might want to install updates right away. If you have older apps or specific workflows that might break, you might wait a few days to see if others report problems first. Both approaches are reasonable.

Key Takeaways

  • iOS updates download automatically on Wi-Fi, but installation requires your action or happens overnight when your phone is charging.
  • You can install an update immediately through Settings > General > Software Update, or wait for the automatic overnight installation.
  • Turning off automatic updates in Settings > General > Software Update > Automatic Updates lets you choose exactly when to install.
  • Delaying an update for a few days is safe and lets you see if other users report problems before you install.

Install an update immediately through Settings

Open Settings on your home screen, then tap General. Scroll down and tap Software Update. Your phone will show the current version and whether an update is available. If an update is ready, tap Install Now. Your phone will restart during the process — this is normal and takes a few minutes.

Make sure your phone has at least 50% battery before you start, or plug it in. If you're on cellular data instead of Wi-Fi, your phone will ask you to connect to Wi-Fi first — updates are large files and use a lot of data.

Let your phone install updates automatically overnight

If you don't want to think about updates, leave automatic installation on. Go to Settings > General > Software Update > Automatic Updates and make sure the toggle is on (it's on by default). Your phone will download updates on Wi-Fi and install them automatically between midnight and 5 a.m. when your phone is plugged in.

This is the simplest approach if you don't have concerns about compatibility with your apps or workflows. You'll wake up to the new version already installed.

Turn off automatic updates if you want to control the timing

Go to Settings > General > Software Update > Automatic Updates and turn the toggle off. Now updates will download, but your phone won't install them without your permission. You'll see a notification that an update is ready, and you can tap Install Now whenever you're ready.

This approach is useful if you use apps that sometimes have compatibility issues with new iOS versions, or if you want to wait a few days and read what other users are saying about a new update before you install it. Waiting three to five days is safe — Apple continues to support older versions during that window.

Check your current iOS version if you're not sure what you have

Open Settings, tap General, then tap About. Look for "Software Version" — that's the number you have now. If you want to know what the newest version is, go back to Settings > General > Software Update. Your phone will show your current version and whether a newer one is available.

You don't need to know version numbers to update successfully. Your phone handles the technical details. Knowing your current version is only useful if an app stops working and you need to tell someone what iOS you're running.

What to do if an update fails or gets stuck

If your phone shows an error during installation, the most common fix is to restart and try again. Hold down the side button and one of the volume buttons until the power-off slider appears, then slide to turn off your phone. Wait 30 seconds, then turn it back on. Go to Settings > General > Software Update and try installing again.

If the same error appears twice, connect your phone to Wi-Fi, make sure it has at least 50% battery, and wait a few hours before trying again. Sometimes Apple's servers are busy and retrying later works. If the error persists after that, you can update through a computer using Finder (on Mac) or iTunes (on Windows), but this is rarely necessary.

Understand what happens during an update

When you install an update, your phone restarts several times. The screen will show an Apple logo and a progress bar. This is normal. Don't turn off your phone or unplug it during this process — let it finish, which usually takes 10 to 20 minutes depending on your phone model and the size of the update.

Your apps, photos, messages, and settings stay exactly as they are. An update changes the operating system underneath, not your personal data. After the update finishes, your phone will work the same way it did before, just with new features or security improvements.

Frequently Asked Questions

Will updating delete my photos or messages?

No. Updates change the operating system, not your personal data. Your photos, messages, contacts, and app data all stay on your phone. If you're worried, you can back up to iCloud before updating — go to Settings > [Your Name] > iCloud > iCloud Backup and tap Back Up Now.

Can I use my phone while an update is installing?

No. Your phone restarts during installation and won't respond to touches or taps. The process usually takes 10 to 20 minutes. Don't interrupt it by turning off your phone or unplugging it.

What if I don't want to update at all?

You can delay indefinitely by turning off automatic updates and simply not installing when prompted. However, older iOS versions eventually stop receiving security updates. Apple typically supports the current version and the two previous versions, so staying within a year or two of the newest version is reasonable for security.

Do I need Wi-Fi to update, or can I use cellular data?

Your phone will download the update on Wi-Fi if available, but will ask you to connect to Wi-Fi before installing. Updates are large files — typically 500 MB to 3 GB — and using cellular data would be expensive for most plans.

Why is my phone so slow after I update?

New updates sometimes cause temporary slowness for a few hours as your phone indexes files and optimizes storage. If slowness continues after a day, restart your phone. If it persists, go to Settings > General > iPhone Storage and delete apps you don't use, or photos and videos you've backed up to iCloud.