Apple does a big update of iOS (the operating system that runs on all iPhones) once a year, bringing new features and interface tweaks. There are also numerous smaller point updates, with fixes and security patches; these are just as important.
In this article we run through everything you need to do to update your iPhone to the very latest available software (iOS 16) including what to do if you encounter problems, like not having enough space or not being able to connect to Wi-Fi.
Is iOS 16 available?
Yes, iOS 16 is now available. In fact, now the next big update iOS 16.1 is available, so if you had been waiting for that to arrive before updating to iOS 16, now you may want to consider updating your iPhone.
If you open Settings, tap General, then Software Update you should see a prompt to download and install it. If it has been awhile since release, you might even get a notification prompting you to update.
See our list of every version of iOS where you can see the latest versions and how long Apple supports iOS for.
How to get your iPhone ready for an iOS update
Before you update iOS, we recommend that you do the following:
- Back up your iPhone. You can do this using iCloud, or via the Finder on a Mac or iTunes on a PC. We explain how to back up here. In the past people have lost data like old SMS messages and photos during an update, so we can’t emphasize enough how important this step is!
- If you want to be extra cautious you could save a copy of the previous version of iOS—we explain how below. This is in case you have to go back later, but if this is beyond you, don’t worry about this step.
- Make some space on your iPhone. You will need a fair amount of space available for the update. If you don’t have a spare 20GB or so on your phone then delete some apps to make room – you can reinstall them afterwards as you already own them so they are associated with your account. If you don’t have enough space, iOS will also offer to temporarily remove some files for you.
- Plug your iPhone into a power supply—the new version of iOS won’t install if your battery is low.
- Make sure you’re downloading over Wi-Fi, not via cellular, or you may end up running out of data. Also, check it’s a safe network. (We don’t recommend you do this over hotel Wi-Fi, for instance.)
How to update an iPhone to iOS 16
Here’s how to download and install the latest version of iOS on your iPhone:
- Go to Settings > General > Software Update. iOS will check if there’s a new version; if there isn’t, you’ll see the message with the software version and “iOS is up to date.” Sometimes there’s a bit of a wait until the software becomes available.
- Assuming there is a new version available, tap Download and Install.
- Enter your passcode when prompted, and agree to the terms & conditions if required.
- Your device will download the update in the background. You’ll see an indication of how much time it is likely to take. In our experience this is very far from the mark: the reality can be double or even triple what this estimates! You can at least carry on with other things while the download happens. Once the download has finished you will receive a notification.
- Tap Details on the notification window. This will take you back to Settings > General > Software Update.
- Tap Install Now. (Again, expect this step to take a while, especially if it’s on the night the software arrives!)
- Alternatively, you can select Later. iOS will offer to update during the night, you just need to make sure the device is plugged in.
How to update iOS if you don’t have Wi-Fi
Are you really excited about updating iOS but don’t have access to Wi-Fi right now? Or maybe you do, but it’s hotel/restaurant Wi-Fi, and you aren’t sure you can trust it? You might be wondering whether you can update iOS using cellular data or mobile data.
Apple used to have a download cap that meant you couldn’t download more than 200MB over a data connection. This cap was lifted in iOS 13, so you can now download apps of any size. Go to Settings > iTunes & App Store > App Downloads. You can choose from Ask If Over 200MB, Always Allow, or Always Ask.
If you’re still running iOS 12, you will still have the data cap meaning you can’t download iOS 13 or later over data, but there is a workaround as long as you have a Mac.
Before you start, make sure you don’t use up all your data for the month! Even “unlimited data” isn’t always completely unlimited and you might be penalised later on.
To update iOS using mobile data (or cellular data) follow these steps:
- Create a Hotspot from your iPhone. This way you can use the data connection from your iPhone to connect to the web on your Mac.
- Now open iTunes and plug in your iPhone.
- Click on the icon in iTunes that represents your iPhone.
- Click on Check for Updates.
- Run through the options to download and install the latest version of iOS.
Your Mac will proceed to download the latest version of iOS using your data connection from your iPhone. You will then be able to use Finder to update iOS on your iPhone.
Alternatively, if your Mac happens to be connected to the internet via Ethernet, or another way, you could download iOS using Finder in exactly the same way as above. (Note that Apple killed off iTunes with the arrival of macOS Catalina, so on Macs running that version of macOS earlier, iTunes manages things like software downloads.)
How to update iOS if you don’t have space
Downloading via the Finder or iTunes is also a great way to update iOS if you don’t have enough space on your iPhone, so follow the steps above.
Alternatively, you could try these steps to make some more space on your iPhone.
Will the iPhone update erase my data?
If you’re low on space you may be worried that you will lose some of your data if you install the new iPhone update. It’s understandable that some people are concerned about this, because it’s happened in the past. However, it should be the case that once the iOS update has installed, all your data will be intact, and if it isn’t, well you have a backup don’t you?
Make sure you back up your phone before updating.
Why won’t my iPhone update?
You may be wondering why your iPhone isn’t showing the iOS update as available. There are a few reasons why this might be the case.
- You might just be too eager. There can be a delay before the big yearly iOS update appears. Inevitably someone you know will see it sooner.
- Your phone might be too old to run the latest version of iOS. Find out which iPhones can get iOS 16.
- You might not be connected to Wi-Fi. As we said above, you need Wi-Fi, but there are workarounds.
- Your battery may be low. Apple required your iPhone to be plugged in or your battery to be above a certain level in order to update.
If those points don’t apply to you, try installing via the Finder or iTunes as we detailed above.
What to do if the iPhone update is frozen
So, you followed all our advice and yet the update is taking AGES! Perhaps your iPhone appears to have frozen, or the update is stuck near the end. What should you do?
First off, it might just be slow, especially if you are updating just after a major update has been issued. Sometimes an update can take all night! Whenever a new iteration of iOS comes out, we recommend giving it a few days just to let the clamour die down and any bugs get ironed out before you put it on your device.
If you think you update has frozen wait a little longer just in case it’s just taking a long time. If you are sure that the update has frozen, rather than just slowed to snail’s pace, you should restart your iPhone. The process to restart your iPhone depends on the model you have, but since iOS 16 won’t run on anything older than the iPhone 8 you will only need to know the following steps:
For all iPhones with Face ID and iPhone 8 or 2nd-generation iPhone SE: Quickly press and release the volume up button > press and release the volume down button > press and hold the side button > keep holding it until the Apple logo appears > then release.
Hopefully you will be able to start the install again without any problems.
Another reason why an iPhone update might stop is if your Wi-Fi connection has dropped. If you are installing the update a few months after the launch there should be no problems with busy servers or long delays. In that case, if you are having issues with the download time, it may be that your Wi-Fi network isn’t performing. Read this: How to fix problems with WiFi on iPhone or iPad.
What to do if the iPhone update is stuck Verifying Update
Once the iOS update is downloaded on your device it will be verified by Apple. If your device gets stuck on this screen it may be because your Wi-Fi connection has dropped, so check your internet connection.
If that’s not the culprit then try restarting your device as per the steps above.
How to upgrade iOS from a beta version
If you previously tried out a beta version of iOS ahead of its full release, you should note that in order to get upcoming non-beta iOS releases you will need to remove the Apple configuration profile from your device.
You can do this by going to Settings > General > VPN and Device Management and selecting iOS Beta Software Profile, then choosing Delete Profile and entering your passcode to confirm the change. From now on you will receive official updates (rather than beta updates) as normal.
How to get a copy of the old version of iOS
What happens if you change your mind later and want to downgrade to the previous version of iOS? Downgrading is really tricky, so we can’t guarantee that having the old version will mean you can revert, but here’s the method to use.
- On your Mac, open the Finder.
- Hold down the Option/Alt key in Finder and select Go > Library.
- Select the Software Updates folder for your device if it’s there.
- Alternatively, launch your web browser and go to IPSW.me and find the right one for your device.
We have a separate article that explains how to revert to an older version of iOS.
If you’ve already started the update and are finding that there are problems, read what to do if you can’t update iOS.
And if your iPhone doesn’t run the new version of iOS, you might want to check our roundup of the Best iPhone deals so you can save money while bagging yourself a shiny new device.