How to Prepare Your iPhone for iOS 27 Without Losing Data

To prepare your iPhone for iOS 27 without losing data, make a fresh backup, confirm that your model is supported, check available storage, update essential apps, and verify that you know your device passcode and Apple Account password. Then connect the phone to power and Wi-Fi and go to Settings > General > Software Update.

Apple says iOS 27 becomes available on September 14, 2026. A careful 20-minute pre-update check can prevent the most common problems: an incomplete backup, too little storage, an inaccessible two-factor authentication app, or a forgotten account password.

Quick iOS 27 preparation checklist

• Confirm your iPhone appears on Apple's iOS 27 compatibility list.
• Install the latest available iOS 26 security and maintenance update first.
• Create a new iCloud or computer backup and verify its date and time.
• Free enough storage for the download and installation process.
• Update banking, authentication, work, and messaging apps.
• Know your iPhone passcode and Apple Account password.
• Confirm that your trusted phone number and recovery options still work.
• Connect to reliable Wi-Fi and keep the iPhone plugged into power.

When is iOS 27 available?

Apple's official iOS 27 page lists September 14 as the release date. The update may not appear on every phone at exactly the same minute, and demand can make the download slower during the first few hours.

If your iPhone is essential for work, travel, payments, or medical accessories, waiting a day or two can be sensible. That gives you time to check whether the apps and accessories you depend on have confirmed compatibility. You do not need to install a major iOS release the instant it appears.

Which iPhones support iOS 27?

According to Apple's current compatibility list, iOS 27 supports these models:

• iPhone Duo, iPhone 18 Pro, and iPhone 18 Pro Max
• iPhone 17, 17e, 17 Pro, and 17 Pro Max
• iPhone Air
• All iPhone 16 models, including iPhone 16e
• All iPhone 15, 14, 13, and 12 models
• iPhone 11, 11 Pro, and 11 Pro Max
• iPhone SE (2nd generation and later)

There is an important distinction: an iPhone can support iOS 27 without supporting every Apple Intelligence or Siri AI feature. Apple says Apple Intelligence on iPhone requires iPhone 15 Pro or 15 Pro Max, or an iPhone 16 model or later. Language, region, and rollout availability can also affect individual AI features. If you are considering new hardware mainly for iOS 27 features, our iPhone Duo vs Galaxy Z Fold8 comparison explains how Apple's newest foldable fits into the current lineup.

1. Install the latest update already available

Before moving to iOS 27, open Settings > General > Software Update and install any current iOS 26 update Apple offers. This is not always mandatory, but it can deliver security fixes and update components that make the major upgrade smoother.

Restart the iPhone after the update. Then check the Software Update screen again. If the phone belongs to an employer or school, a management profile may control when major releases become available; contact the administrator rather than removing the profile.

2. Make a fresh backup—and verify it

A backup is the most important protection against data loss. Do not rely on the assumption that an automatic backup happened recently.

Back up with iCloud

1. Connect the iPhone to Wi-Fi.
2. Open Settings and tap your name.
3. Tap iCloud > iCloud Backup.
4. Tap Back Up Now and keep the phone connected until it finishes.
5. Confirm that the screen shows a successful backup with the current date and time.

Apple's official iPhone backup guide also explains computer backups. If iCloud says there is not enough space, check Settings > your name > iCloud > Storage or Manage Account Storage > Backups > this iPhone. Apple's iCloud backup troubleshooting guide shows where to find the estimated next-backup size.

Consider an encrypted computer backup

A local encrypted backup made with Finder on a Mac or the Apple Devices app on Windows is a useful second copy. Encryption matters because an unencrypted computer backup may omit saved passwords, Wi-Fi settings, Health data, and some other sensitive information. Store the encryption password safely; Apple cannot recreate it for you.

If the iPhone is your only way to receive security codes, review your authentication setup before installing. Our guide to moving Google Authenticator without losing codes covers one common risk. It is also worth understanding how passkey recovery works if you lose access to a phone.

3. Check storage without deleting important data

Open Settings > General > iPhone Storage. The space required varies by model, current iOS version, and update method, so there is no single safe number for every iPhone. Leave several gigabytes free if possible and follow the storage estimate shown by Software Update.

Start with reversible cleanup:

• Delete downloaded movies, podcasts, music, and offline maps that can be downloaded again.
• Remove large message attachments you no longer need.
• Use Offload App for rarely used apps; this removes the app but preserves its documents and data.
• Empty the Recently Deleted albums only after confirming the photos and videos are backed up elsewhere.
• Restart the phone after cleanup so the storage estimate can refresh.

Avoid mass-deleting photos immediately before the update. If iCloud Photos is enabled, deleting a photo on the iPhone also deletes it from other synced devices and iCloud.

4. Update the apps you depend on

Open the App Store, tap your profile picture, and install available app updates. Prioritize:

• Banking and payment apps
• Password managers and authentication apps
• Work VPN, device-management, and communication apps
• Health, accessibility, vehicle, and smart-home apps
• Apps used with hearing aids, medical devices, cameras, or other accessories

For a business-critical app, check the developer's support page or release notes for explicit iOS 27 compatibility. A major iOS upgrade is a poor time to discover that an old app is no longer maintained.

5. Verify passwords, recovery options, and cellular access

Make sure you know the iPhone passcode and Apple Account password. Confirm that the trusted phone number under your Apple Account is current. If you use an eSIM, keep the carrier's account details and support information available; the update should not remove an eSIM, but those details are useful if activation trouble occurs.

Do not sign out of iCloud or erase the phone as routine preparation. Those steps add risk and are unnecessary for a normal software update.

6. Prepare power and network connections

Apple recommends connecting the iPhone to power and Wi-Fi. Use a stable private network rather than hotel, airport, or café Wi-Fi that requires a browser sign-in. If a VPN or DNS-filtering app causes the update check to fail, pause it temporarily and try again, then re-enable it after installation.

Bluetooth accessories do not need to be removed. However, charge devices you depend on—such as an Apple Watch, hearing aid, or car key—and keep another communication option nearby if the phone is essential.

How to install iOS 27

1. Connect the iPhone to power and Wi-Fi.
2. Open Settings > General > Software Update.
3. Select iOS 27 if more than one update is offered.
4. Tap Download and Install or Update Now.
5. Enter the passcode and accept the terms when prompted.
6. Keep the phone connected to power while it prepares, restarts, and completes setup.

Apple's current wireless update instructions cover the same official path. You can also open Automatic Updates on the Software Update screen to choose whether iOS downloads and installs future updates automatically.

What if iOS 27 does not appear?

First confirm the model is compatible and that the phone has an internet connection. Then:

1. Return to Settings > General > Software Update after a few minutes.
2. Restart the iPhone and check again.
3. Disable a VPN temporarily if the update check reports an error.
4. Confirm the date and time are set automatically.
5. Check for an employer or school management profile.
6. Connect the iPhone to a Mac or Windows PC and check for an update through Finder or Apple Devices.

If you previously installed beta software, the screen may offer a beta track instead of the public release. Open Settings > General > Software Update > Beta Updates and select Off if you want the stable public version.

What to do if the update is stuck or fails

During installation, an Apple logo and progress bar can remain still for a while. Keep the iPhone on power and give it time. Do not repeatedly force-restart it simply because the bar pauses.

If the download fails before installation begins, return to iPhone Storage, find the downloaded iOS update, delete that update file, restart the phone, and download it again. If the device cannot finish starting, connect it to a computer and use Apple's update or recovery process. Choose Update before Restore when the computer offers both; Restore erases the device.

Checks to make after iOS 27 installs

After setup completes, unlock the phone and verify the services that matter most:

• Cellular calls, SMS, and mobile data
• Wi-Fi, Bluetooth, AirDrop, and personal hotspot
• Photos, Messages, Notes, Contacts, and files
• Banking apps, password managers, and authentication codes
• Apple Pay cards and transit passes
• Work email, VPN, and device-management profiles
• Health accessories, hearing devices, car connections, and smart-home controls

The phone may feel warmer or use more battery immediately after a major update while it indexes files, refreshes apps, and completes background work. Keep it on Wi-Fi and power when convenient, update any apps that gained new versions, and judge battery behavior after normal background activity settles.

Final advice

The safest iOS 27 upgrade is not complicated: verify compatibility, make a backup you can confirm, protect your authentication methods, free storage conservatively, update essential apps, and install on reliable power and Wi-Fi. Those steps give you both a smoother update and a recovery path if something unexpected happens.