iOS 27 bugs: known issues and how to fix them

First, check which iOS 27 build you are on

Many bugs disappear simply by moving to a newer build, so start by checking yours in Settings › General › About.

If you are on an old summer beta, update before you troubleshoot anything else. Open Settings › General › Software Update and install what is offered.

Quick fixes that solve most iOS 27 problems

Run through these in order before you try anything specific. They take a few minutes and clear a surprising number of issues.

1. Install the latest update in Settings › General › Software Update.
2. Restart the iPhone. If it is frozen, force restart it: press volume up, press volume down, then hold the side button until the Apple logo appears.
3. Update your apps in the App Store.
4. Free up storage in Settings › General › iPhone Storage. Updates and indexing need room to work.
5. Leave the iPhone on Wi-Fi and a charger overnight so background indexing can finish.

Battery drain and overheating

Battery drain and a warm iPhone in the first days after updating are the most common iOS 27 complaints, and usually the least serious. iOS 27 rebuilds its search index across Spotlight, Photos, Mail and Messages, and supported iPhones may also download Apple Intelligence models. Beta builds add extra diagnostic logging on top.

1. Give it 48 hours on Wi-Fi and a charger before judging battery life.
2. Open Settings › Battery and look for one app using far more than the others.
3. Limit background activity in Settings › General › Background App Refresh for apps that do not need it.
4. Review Settings › Privacy & Security › Location Services and set rarely used apps to Never or While Using.
5. Turn on Low Power Mode on heavy days.
6. If the iPhone gets hot while charging, take it out of its case and stop using it until it cools.

If drain is still bad after a few days, check battery condition in the Battery Health section of Settings › Battery. Our list of battery tips for the iOS 27 beta goes further.

Wi-Fi and cellular problems

Wi-Fi that drops, refuses to join a known network, or shows connected with no internet is usually fixed by forgetting and rejoining the network.

1. Toggle Wi-Fi off and on in Control Center or Settings.
2. Turn Airplane Mode on for 30 seconds, then off.
3. Open Settings › Wi-Fi, tap the info button next to the network, choose Forget This Network and rejoin.
4. Restart the iPhone and the router.
5. For that network, turn off Private Wi-Fi Address and test again.
6. As a last step, use Settings › General › Transfer or Reset iPhone › Reset › Reset Network Settings. This removes saved Wi-Fi passwords and VPN settings.

For no cellular service, toggle Airplane Mode, check Settings › General › About for a carrier settings prompt, and remove and reinsert a physical SIM. The full walkthrough is in our Wi-Fi not working guide.

Bluetooth and AirPods disconnecting

Forgetting and re-pairing the accessory fixes most Bluetooth problems after an update.

1. Toggle Bluetooth off and on.
2. In Settings › Bluetooth, tap the info button next to the device and choose Forget This Device.
3. Restart the iPhone and the accessory, then pair again.
4. For AirPods, put them in the case, open the lid and hold the setup button for about 15 seconds until the light flashes amber, then pair again.
5. Check that the accessory's own firmware is up to date.

More steps, including car systems, are in our Bluetooth not connecting guide.

Apps crashing or freezing

Third-party apps crashing on launch is the classic beta problem. Banking apps, streaming apps with strict copy protection and anything that uses the camera at a low level tend to break first, because developers need time to update for a new system.

1. Update the app in the App Store.
2. Force-close it by swiping up from the bottom of the screen and swiping its card away, then reopen it.
3. Offload and reinstall it: Settings › General › iPhone Storage, pick the app, tap Offload App, then Reinstall App.
4. If it is critical, use the service's website in Safari until a fix arrives.
5. Report it to the developer and to Apple.

If the whole iPhone freezes, force restart it. To see which app is crashing, look in Settings › Privacy & Security › Analytics & Improvements › Analytics Data. If freezes keep happening, try Settings › General › Transfer or Reset iPhone › Reset › Reset All Settings, which resets settings but keeps your data.

Apple Intelligence or Siri not working

When Apple Intelligence or the new Siri AI does not appear, the cause is usually the device, not a bug.

1. Confirm your iPhone has an A17 Pro chip or newer: iPhone 15 Pro, 15 Pro Max, any iPhone 16 or iPhone 17 model (including 16e and 17e), iPhone Air, or iPhone 18 Pro and 18 Pro Max. The iPhone 15 and 15 Plus do not get Apple Intelligence.
2. Open Settings › Apple Intelligence & Siri and make sure it is turned on.
3. Stay on Wi-Fi with free storage while the on-device models download.
4. Check Settings › General › Language & Region and the Siri language, since supported languages vary.
5. Restart the iPhone and check again.

If Siri does not respond at all, check that it is switched on in Settings › Apple Intelligence & Siri, that nothing is covering the microphones, and that you have an internet connection. Our guide on how to enable Apple Intelligence covers setup in detail.

Camera, Photos and display issues

Camera and Photos problems after an update are often temporary, because Photos re-processes your library in the background.

• Camera opens to a black screen: force-close Camera, restart the iPhone, and make sure you have free storage.
• Photos slow or thumbnails missing: leave the iPhone on Wi-Fi and a charger overnight, then check iCloud sync status in the Photos section of iCloud settings.
• Screen dim or auto-brightness odd: toggle Auto-Brightness in Settings › Accessibility › Display & Text Size, and check True Tone and Night Shift in Settings › Display & Brightness.
• Touch not registering: clean the screen, remove the screen protector to test, and force restart. If it persists across restarts, contact Apple Support, as it may be hardware.

Face ID, notifications and storage

• Face ID failing: clean the front sensors, then go to Settings › Face ID & Passcode, choose Reset Face ID and set it up again in good light.
• Notifications missing: check the app in Settings › Notifications and make sure a Focus in Settings › Focus is not silencing it.
• Storage filling up: restart to clear temporary files, then review Settings › General › iPhone Storage and offload large apps you rarely use.

If an update gets stuck

A beta install can sit on the Apple logo much longer than a normal update. Wait before acting. If nothing has moved for a long time, force restart once; if that does not help, use recovery mode from a computer and choose Update before Restore. The full procedure is in our guide to an iPhone stuck on the Apple logo.

When to downgrade instead

If a bug makes your iPhone unusable and the fixes above do not help, you have two ways out.

A backup made on iOS 27 cannot be restored onto iOS 26. Our iOS 27 to iOS 26 downgrade guide walks through the restore.

What to do next

When you find a bug that survives a restart and an update, report it with the Feedback app so Apple can fix it in a later build. Our guide to reporting iOS 27 beta bugs shows what to include.

Frequently asked questions