iOS 27 Problems and How to Fix Each of Them (2026)

Almost every list of iOS 27 problems comes down to the same few complaints: battery drain, an iPhone running warm, Wi-Fi that drops, apps that crash, and Apple Intelligence that won’t turn on. In our testing on iPhone 15 Pro and iPhone 16 units on the iOS 27 beta, most turned out to be temporary side effects of updating, not real bugs. This page is the map: every problem, its top fix, and the full walkthrough.

#First Steps After Updating to iOS 27

Before you chase any single problem, run the four universal first steps. They clear most of the noise that makes a fresh iOS 27 install feel broken.

Back up first, then give the update room to settle. According to Apple’s “Update your iPhone or iPad” guide, you should back up the device before you update, and the installer will temporarily remove apps if it needs more space. So the two things to check on day one are a recent backup and free storage.

Apple’s iCloud backup guide recommends keeping an iCloud or computer backup so you have a copy of your data if anything goes wrong. It takes only a few minutes to set up.

Here’s the short checklist we run on every iPhone right after a major update:

• Back up the iPhone to iCloud or a computer before doing anything else.
• Free up storage. A nearly full iPhone makes downloads and reindexing fail quietly.
• Update every app in the App Store. This alone fixes most crashing and freezing.
• Restart while charging. Power off, wait 30 seconds, then power on plugged in.

If those four don’t settle things within a few days, the rest of this page covers each specific problem in turn.

#Why Is My iPhone Battery Draining So Fast on iOS 27?

Fast battery drain is the single most reported iOS 27 problem, and for the first few days it’s expected. Spotlight, Photos, and Mail all reindex in the background after a major release, which burns through a charge faster than usual. The work is invisible, so it just looks like the update wrecked your battery when it’s really the system catching up.

Wait it out for 3 to 5 days, then open Settings > Battery to see which app is the real culprit. If the drain hasn’t eased after a week, that’s no longer settling-in. Our iOS 27 beta battery drain guide has the full 7-step fix.

#iPhone Overheating After the iOS 27 Update

An iPhone running warm for a day or two after updating is almost always normal. It’s the same background reindexing, and the heat fades on its own.

The chip is rebuilding your search and photo libraries, so it warms up under light use. Take the case off, keep it out of direct sun, and avoid heavy gaming until the indexing finishes. If your iPhone is hot to the touch days later or while idle, something is stuck. The full breakdown of normal versus abnormal heat is in our iPhone overheating after iOS 27 guide.

#Wi-Fi Keeps Dropping on iOS 27

Wi-Fi that seems to drop after the update is often Wi-Fi Assist doing its job, not a real disconnect. The feature switches you to cellular the moment Wi-Fi dips, which looks exactly like a dropout.

Turn Wi-Fi Assist off first in Settings > Cellular, then forget the network and rejoin it to clear a stale connection profile the update may have left behind. If the connection is still unstable, our Wi-Fi keeps dropping after iOS 27 guide has the network-reset sequence and router-side checks.

#Apps Keep Crashing After Updating to iOS 27

Apps crashing or freezing usually means the app hasn’t caught up to the new iOS yet. The fix is often just an App Store update.

Open the App Store and update the crashing app first. If that doesn’t help, offload and reinstall it to clear corrupted cached data from the old iOS version. The complete fix order, including what to do when every app crashes at once, is in our apps crashing after iOS 27 guide.

#Why Won’t Apple Intelligence Turn On After iOS 27?

Apple Intelligence not working is mostly a hardware and storage story, not a bug. The features need an iPhone 15 Pro or any iPhone 16, plus 7 GB of free storage, and they download on-device models the first time you switch them on.

That download is throttled, which is why the toggle so often looks frozen. According to Apple’s Low Power Mode support page, Low Power Mode turns off automatic downloads and background app refresh, and the model download is exactly that kind of background task. So even on fast Wi-Fi, the install can sit at “Preparing” while the battery icon is yellow. Turn Low Power Mode off, plug in, free up 7 GB, and leave it on Wi-Fi.

In our testing on an iPhone 16, a “Preparing” spinner that had sat idle all morning cleared within an hour once the phone was charging and off Low Power Mode. If the toggle is stuck or missing entirely, our Apple Intelligence not working guide covers every cause in order.

Two specific Apple Intelligence features trip people up most:

• Writing Tools greyed out. The menu is dimmed because Apple Intelligence is off, still downloading, or unsupported on your iPhone. Our Writing Tools greyed out guide has the exact sequence.
• Genmoji or Image Playground missing. Same root cause, plus these two need the models fully installed. See our Genmoji and Image Playground guide for the fix.

#iOS 27 Problem and Quick Fix Table

This is the fast lookup. Find your symptom in the left column, apply the one-line fix, then open the full guide if it needs more than that.

#iPhone Showing No Service After iOS 27

A “No Service” or “Searching” bar after the update is usually a carrier-settings hiccup, not a dead radio. The fix is quick.

Turn on Airplane Mode for at least 15 seconds, turn it back off, then install any waiting carrier settings update under Settings > General > About. If the bars still won’t come back, our iPhone no service after iOS 27 guide runs through all 9 fixes, including the network-settings reset and eSIM checks.

#When the Update Itself Gets Stuck

Sometimes the problem isn’t after the update, it’s the install hanging on “Preparing” or “Verifying.” Both have the same root causes: a weak connection, low storage, or Apple’s servers being slammed on launch day.

For a hang on the progress bar, free up space and restart, then resume the download on stable Wi-Fi. Our iPhone stuck on Preparing Update guide and iPhone stuck on Verifying Update guide cover the force-restart and recovery-mode steps for each. If iOS 27 itself is the problem and you want off the beta, that’s a separate path entirely.

#Bottom Line

For most iOS 27 problems, the answer is patience plus the basics: update your apps, free up storage, and restart while charging. Give it 3 to 5 days before deciding anything is broken.

If a specific issue survives a week of normal use, jump to its full guide above. And if your iPhone is older than the 15 Pro, Apple Intelligence simply won’t appear, so stop troubleshooting that one. New to the release? Our iOS 27 new features guide and iOS 27 compatible iPhones list cover what changed and which models made the cut.

#Frequently Asked Questions