How to Prepare Your iPhone for the iOS 27 Beta: The Pre-Install Checklist

Where the iOS 27 beta stands today

The current beta is iOS 27.2 beta 4 (build 24B5110a), released on 13 October 2026. iOS 27.0 shipped to the public on 14 September 2026, and the current public release is iOS 27.0.1 (24A446).

That changes what preparation means compared with June. If your iPhone is still on iOS 26, turning on the beta takes it straight to iOS 27.2 beta. If it already runs iOS 27.0.1, the beta is a smaller step, but the same rules about backups and leaving the beta apply.

The pre-install checklist

Step 1: Check that your iPhone supports iOS 27

iOS 27 runs on 33 iPhone models: iPhone 11 and later, plus iPhone SE (2nd and 3rd generation). That is every iPhone that ran iOS 26. iPhone XS, XS Max, XR and older cannot install it.

1. Open Settings.
2. Go to Settings › General › About.
3. Read the Model Name line.

Apple Intelligence is a separate question. It needs an A17 Pro chip or newer, which means iPhone 15 Pro, iPhone 15 Pro Max and every iPhone 16, 17 and 18 model, including iPhone 16e, iPhone 17e and iPhone Air. iPhone 15 and 15 Plus run iOS 27 without Apple Intelligence. The iOS 27 supported devices list has the full breakdown by model.

Step 2: Free up storage space

The update needs more room than its download size, because iOS unpacks and verifies the files before it installs them. Keeping about 15 GB free gives you a comfortable margin.

1. Open Settings › General › iPhone Storage.
2. Wait a few seconds for the bar to finish calculating.
3. Check the space used against your total capacity, then work through the largest items in the list.

• Offload unused apps. Settings › General › iPhone Storage › Offload Unused Apps removes the app but keeps its documents and data.
• Delete large videos. In Photos, open the Videos collection and remove or archive long clips.
• Merge duplicates. The Duplicates collection in Photos merges identical shots.
• Clear Safari data. Settings › Apps › Safari › Clear History and Website Data.
• Remove downloaded podcasts and offline media you have already played.
• Limit message history. Settings › Apps › Messages › Keep Messages set to 1 Year deletes older threads and attachments.

Our guide to iOS 27 beta storage space explains why System Data grows on beta builds and how installing from an IPSW needs less free space on the iPhone itself.

Step 3: Back up and archive the backup

Make your backup before you install, on the version you are running now. A backup made on a beta cannot be restored onto an older iOS version, so a backup taken after you install is no use if you want to leave.

Encrypted computer backup (the one that matters)

1. Connect the iPhone to your Mac or PC with a cable and tap Trust if asked.
2. Open Finder on a Mac, or the Apple Devices app on Windows, and select your iPhone.
3. Choose Back up all of the data on your iPhone to this computer.
4. Tick Encrypt local backup and set a password you will remember. Encryption includes saved passwords, Wi-Fi settings and Health data.
5. Click Back Up Now and wait for it to finish.
6. Open Manage Backups, right-click the new backup and choose Archive. An archived backup is never overwritten by later backups.

iCloud Backup

1. Connect to Wi-Fi and plug the iPhone in.
2. Go to Settings › [your name] › iCloud › iCloud Backup.
3. Make sure Back Up This iPhone is on, then tap Back Up Now.
4. When it finishes, check that the last successful backup time shows today.

iCloud Backup cannot be archived, and once you are on the beta your next iCloud backup replaces the pre-beta one. Treat it as a convenience copy, not your way back. The full process, including restoring, is in our backup and restore guide for the iOS 27 beta.

For anything you cannot afford to lose, keep a manual copy too: export important notes as PDFs, save voice memos to Files, and note your active subscriptions under Settings › [your name] › Subscriptions.

Step 4: Enroll your Apple Account

Both betas are free with any Apple Account. You do not need a paid developer membership, and you do not need a configuration profile; Apple retired beta profiles in 2023.

• Developer beta: install the free Apple Developer app from the App Store, open it and sign in once with your Apple Account.
• Public beta: sign in at beta.apple.com with the same Apple Account your iPhone uses and accept the agreement.

Once enrolled, the option appears under Settings › General › Software Update › Beta Updates. The walkthrough in how to join the Apple Beta Software Program covers enrollment step by step.

Public beta or developer beta?

Choose the public beta if this is your main iPhone. Public builds are aimed at everyday testers. Choose the developer beta if you build apps, have a spare iPhone, or want each build as soon as Apple posts it. Our comparison of the iOS 27 developer beta and public beta sets out the differences.

Step 5: Check your critical apps

Some apps behave badly on beta software, and a few refuse to run at all. Check these before you install.

• Banking and payment apps. Some banks block beta versions of iOS. Look at the app's App Store notes or ask the bank.
• Authenticator apps. Save recovery codes for each account in a password manager or on paper before you install.
• Work apps and managed devices. If your iPhone is managed by an employer, ask IT first. Some organisations do not allow beta software.
• VPN clients. Have another way to connect if the VPN stops working.
• Medical apps. If you rely on an app paired with a glucose monitor, insulin pump or similar device, do not install a beta on that iPhone.

Step 6: Be honest about the risk

How much risk you can take depends on how much you depend on the phone, not on how stable the build looks.

Step 7: Plan when you install

Allow up to an hour when you will not need the phone. You cannot make calls while it installs, and if something goes wrong you want time to fix it. Avoid the morning before work, travel days and any time you might need a two-factor code. An evening at home with the iPhone on charge and on Wi-Fi is ideal.

What to expect after you install

For the first day or two, iOS re-indexes Photos and Spotlight and re-syncs iCloud data in the background. The phone can feel warm and the battery can drop faster than usual during that time. On Apple Intelligence models, extra on-device models may download in the background. Keep the iPhone on charge overnight and judge battery life after a few days, not a few hours.

When something breaks, report it in the Feedback Assistant app, and check our iOS 27 known bugs and fixes page before you assume it is your device. If the beta proves too rough, the downgrade guide explains how to restore iOS 26.6.1 RC (23G82), the version Apple is signing for iPhones today, and then your archived backup. You can also turn off Beta Updates and simply stay on your current build until a public release with a higher version number arrives.

What to do next

Once every box is ticked, follow the step-by-step guide to downloading the iOS 27 beta to turn on Beta Updates and install iOS 27.2 beta 4.

Frequently asked questions