How to update your iPhone: The complete iOS update guide

There’s a variety of reasons you might want to update the iOS on your iPhone. A regular update might fix a feature that’s been broken for you or patch up a security bug behind the scenes. Or maybe you’re updating to a whole new iOS version, like iOS 13. 

Whatever your reason for updating may be, there are always things to keep in mind before you update. This article talks about some of the things to look out for and lists a few troubleshooting tips for the common issues that come up.


Before you install the iOS 13 update

There are a couple of things you should do before you tap Install. From backing up, which is good to do from time to time anyway, to freeing up some storage space, which can help your iPhone’s overall performance. Go over the tips below to make sure your iPhone is ready to update.

Make sure you have enough space for the update

Typically, iOS updates are between 1.5 GB and 2 GB. But you’ll need twice the space to download and install the update. So, to be conservative, you should have about 4 GB of free space before you try to install iOS 13. To check how much space you have available on your iPhone, go to Settings > General > iPhone Storage.

If you’re looking to free up some space, a good starting point is your Photos app. You probably have clutter like unneeded similar photos, old screenshots, or photos of whiteboards from meetings just taking up space. A quick and easy way to sift through those is with an app like Gemini Photos. 

  1. Download Gemini Photos from the App Store.
  2. Open it and start scanning.
  3. Tap Similar.
  4. Tap on a group of photos.
  5. Review which picture(s) in the group to keep or delete.
  6. After you’ve sifted through the similar photos, go back to Your Library in Gemini Photos.
  7. Continue reviewing categories like Videos, Screenshots, Notes, and Blurred to quickly decide what to keep or delete.
  8. When you’re done, go to Recently Deleted in the Photos app, tap Select, and then Delete All. This will get the photos and videos off your iPhone for good.
Screenshots: Use Gemini Photos to free up space for iPhone software update

Check if your device is compatible with iOS 13

Like with all new iOS versions, not every model of iPhone or iPad will support iOS 13. Before you try to install the new system, make sure you’re running at least iOS 10, and your iPhone or iPad model is compatible with the new iOS.

Here are the iPhones and iPads compatible with iOS 13:

  • iPhone XS Max, iPhone XS
  • iPhone XR
  • iPhone X
  • iPhone 8, iPhone 8 Plus
  • iPhone 7, iPhone 7 Plus
  • iPhone SE
  • iPhone 6s
  • iPhone 6s Plus
  • iPad Pro (2nd Generation, 3rd Generation)
  • iPad Pro
  • iPad (5th generation, 6th generation)
  • iPad Mini (5th Generation)
  • iPad Mini 4
  • iPad Air (3rd Generation)
  • iPad Air 2

Back up your iPhone data

Anytime you update your iPhone, whether it’s a big or small update, you should always back up your phone beforehand. You can back up your iPhone to iTunes or go with the iCloud backup option, but it’s important to have a backup. That way, if something goes wrong during the update, you’ll be able to roll back. 

Screenshots: Back up your iPhone to iCloud before installing the iOS update

How to update your iPhone or iPad

There are a few different ways you can update your iPhone or iPad. The easiest one is initiating the iOS update directly on your device. But if you’re more familiar with updating your device using your computer, then you can use iTunes as well. Whether it’s a smaller update or a new iOS version, updating your device works the same way.

How to update iOS over the air (OTA)

  1. Connect your phone to Wi-Fi and plug it into power.
  2. Go to Settings > Software Update.
  3. Tap Install Now.
  4. Enter your passcode or confirm using Touch ID.
  5. This will start the installation, which may take some time. Your phone will reboot once the update is complete.
  6. Follow any setup steps or enter your passcode to get back to your home screen.

How to update an iPhone using iTunes

  1. Plug your phone into your computer with a USB cable.
  2. Open iTunes.
  3. Click on the phone icon in the top left-hand corner.
  4. Click on Summary in the left sidebar.
  5. Click Check for Updates > Download and Update.
  6. The update may take some time, but your iPhone will reboot once it’s complete.
  7. Follow any setup steps or enter your passcode to get back to your home screen.

How do I force an iOS update?

If you have Automatic Updates turned on on your iPhone, then it will prompt you to install the update overnight if your phone is connected to Wi-Fi and plugged into power. However, if you don’t want to wait for that to happen, you can try and force the update. Here’s how:

  1. On your phone go to Settings > Software Update.
  2. If there’s an update available, tap Download and Install.
  3. Enter your passcode or confirm with Touch ID.
  4. After your phone reboots, follow the setup prompts to finish.
Screenshots: How to manually install the iPhone software update

iPhone update problems and FAQ

It’s not uncommon to run into a problem when you’re updating your iPhone. Especially, if you’re relying on the automatic updates feature, because many prerequisites have to be in place for it to start. 

These conditions need to be met for a successful iOS update:

  • There’s enough free space to download and install the update.
  • Your iPhone is plugged into power.
  • The battery is at least 50% charged.
  • Your iPhone is connected to a strong Wi-Fi network.

If both automatic and manual updates continue to fail for you, you can try the following troubleshooting steps.


The iOS update won’t install

  1. Go to Settings > General > iPhone Storage to view how much space you have.
  2. If you need to free up some space, you can quickly get rid of the clutter in your photo library by using Gemini Photos. Just don’t forget to clear the Recently Deleted folder afterwards.

Downloading the update takes too long

  1. Toggle the Wi-Fi off and then on by going to Settings > Wi-Fi.
  2. If the update continues to stall, try downloading the update from another Wi-Fi network.
  3. If you still cannot update, plug your iPhone into a computer and try updating with iTunes.

The iPhone update never completes

  1. Make sure your iPhone stays connected to power throughout the update.
  2. If it continues to fail, try restarting your iPhone by holding down the Volume Up and Sleep/Wake buttons until the Slide to Power Down option appears.
  3. Slide the slider.
  4. Press and hold the Sleep/Wake button to power your iPhone back on.

If your iPhone is still not updating, you can try deleting the update and redownloading it:

  1. On your iPhone go to Settings > General >iPhone Storage.
  2. Find the iOS update in the list of apps.
  3. Tap the iOS update > Delete Update.
  4. Go to Settings > General > Software Update and download the latest iOS update.

How long does an iOS update take?

The length of time an iOS update can take depends on a lot of things. For example, your internet connection, because that determines how long it will take to download the update. Or what type of update it is — a smaller bug fix update and a big new iOS version will take different amounts of time to install. 

That being said, in a very general sense updates can take anywhere from 10-15 minutes up to 45-60 minutes. 


What happens if you don't update your iPhone software?

While you probably won’t notice the effects of not updating immediately, you will start to notice them over time. Although urban legend says updating your iPhone software slows it down, not updating is what actually slows it down. It can also cause apps to crash more and act buggy. Overall, your iPhone will sooner or later stop working the way it should. Then, of course, you can’t forget about the periodic security fixes that get bundled into updates.


With the rate that software changes, it’s a good practice to keep your iPhone up to date. It’s also a good practice to make sure you have everything backed up before you update. Keeping your software current will keep your device running smoothly.

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