5 things you need to know about the iOS 15.3.1 update

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Apple has pushed a new iOS 15.3.1 update to iPhone users.

The company’s iOS 15.3.1 update is compatible with all phones running iOS 15, listing: iPhone 6s, iPhone 6s PlusiPhone SEiPhone 7, iPhone 7 PlusiPhone 8, iPhone 8 PlusiPhone XiPhone XSiPhone XS MaxiPhone XRiPhone 11iPhone 11 ProiPhone 11 Pro MaxiPhone SE 2, iPhone 12 miniiPhone 12iPhone 12 ProiPhone 12 Pro Maxand the iPhone 13 Series

Unlike iOS 15.3, iOS 15.3.1 is a minor upgrade and brings a major bug fix and new security patch to iPhone owners around the world.

With that in mind, we want to walk you through everything you need to know about Apple’s iOS 15.3.1 update for iPhone.

In this walkthrough, we’ll take you through iOS 15.3.1 changes, software performance, iOS 15.3.1 issues, iOS 15.3.1 jailbreak status, and more. Let’s start with some thoughts on the performance of iOS 15.3.1.

iOS 15.3.1 Review

If your iPhone is currently running iOS 15.3, you will see the smallest download size for iOS 15.3.1.

For iOS 15.3 users, the iOS 15.3.1 download is quite small. iOS 15.3.1 is about 242 MB for iPhone 12 Pro users which is higher than the previous version of iOS 15. You can expect a similar size for other iPhone models.

The exact iOS 15.3.1 download size depends on your iPhone model and the version of iOS currently running. If your iPhone is running an older version of iOS, you’ll see a larger download because your iOS 15.3.1 update includes the changes from iOS updates that you skipped.

If you’re moving from iOS 15.3, the installation process will take less than 10 minutes. It took about seven minutes to install on an iPhone 12 Pro previously running iOS 15.3.

We’ve been using iOS 15.3.1 on a few iPhone models for several days now and here’s what we’ve learned about the software’s performance so far:


  • The battery life is currently stable.
  • Wi-Fi connectivity is fast and reliable.
  • Bluetooth works normally.
  • GPS and mobile data are both stable.

App performance

  • Third-party apps including Netflix, Dark Sky, Twitter, Slack, Asana, Gmail, Chrome, and Spotify currently work fine.
  • First party apps like Safari, Podcasts, and Calendar are also stable.


  • iOS 15.3.1 feels just as fast as iOS 15.3.

If you are encountering bugs or performance issues on iOS 15.3 or an older version of iOS, you may want to install the iOS 15.3.1 update on your iPhone now.

If you need help deciding whether or not to move to iOS 15.3.1, check out our reasons for installing the latest version of iOS 15 or not.

iOS 15.3.1 Problems

The iOS 15.3.1 update is causing issues for some iPhone 12 and iPhone 13 users. Some of these issues are brand new, others are inherited from iOS 15.3 and older versions of iOS.

The current list of issues includes installation issues, UI lag, Exchange issues, first and third party apps issues, touchscreen issues, Touch ID and Face ID issues, and abnormal battery drain.

If you run into a problem on iOS 15.3.1, check out our list of solutions for the most common iOS 15 problems. We’ve also released tips that can help you improve your phone’s performance and some tips that can help fix iOS 15’s poor battery life.

Apple stopped signing on iOS 15.3, which means you won’t be able to revert your iPhone’s software to the previous version of iOS 15 if iOS 15.3.1 starts to cause problems. You also can’t downgrade to anything older than iOS 15.3.

Keep this in mind if you have a good experience with iOS 15.3 or older. Once you’ve made the switch to iOS 15.3.1, there’s no going back.

To learn more about the downgrade process, see our guide.

iOS 15.3.1 Update: What’s New?

The iOS 15.3.1 update has no new features on board. Instead, the software includes a bug fix and a major security patch. Here’s the full iOS 15.3.1 change log:

  • Fixes an issue that may cause braille displays to stop responding.

You can learn more about the security patch at the: company website

iOS 15.3.1 Jailbreak

The developer teams behind the checkra1n and unC0ver jailbreak tools have released versions that are compatible with newer versions of iOS 14, but only Checkra1n (currently in beta) is compatible with iOS 14.5.

Unfortunately, the tools do not support iOS 15.3.1, iOS 15.3, iOS 15.2.1, iOS 15.2, iOS 15.1.1, iOS 15.1, iOS 15.0.2, iOS 15.0.1, iOS 15.0, iOS 14.8, iOS 14.7. 1, iOS 14.7, iOS 14.6 or iOS 14.5.1 not yet.

The latest version of unC0ver is compatible with newer iPhones, including the iPhone 12 series. That’s great news if you’ve been waiting to jailbreak your new phone. Unfortunately, it is only compatible with versions up to iOS 14.3.

There’s no way to downgrade your phone’s software to iOS 14.5 or older versions of iOS, meaning you’re out of luck if you upgrade, or if you’ve already upgraded to newer iOS software.

What’s next

Apple has confirmed that a new version of iOS 15 and iOS 15.4 are currently in beta testing ahead of public release.

The company has not yet confirmed a specific release date, but it will be rolled out sometime next week before the iPhone SE 3 release date.

If your problems with iOS 15.3.1 are really bad, or if you just want to try new features, you can try to download the beta version of iOS 15.4 on your iPhone now.

To learn more about iOS 15.4 and the beta, take a look at our walkthrough. To learn more about the upcoming iOS 15.4 release date, check out our guide.

4 reasons not to install iOS 15.4.1 and 11 reasons why you should

Install iOS 15.4.1 for better security

Install iOS 15.4.1 for better security

If security is important to you, then you should definitely consider installing Apple’s iOS 15.4.1 update right away.

iOS 15.4.1 has one new security patch on board and you can read more about it on Apple’s website† It helps protect your phone from damage.

If you missed the iOS 15.4 update, it had a whopping 36 new security patches on board. To learn more about these patches, visit: Apple’s security site for the details

If you missed iOS 15.3.1, it had one security patch on board. For more information, visit Apple’s security page

If you missed iOS 15.3, you will also get the corresponding patches with your upgrade. iOS 15.3 brought 10 new security patches for iPhone users. If you are interested in the details, you can read more about it here

If you missed iOS 15.2.1, you will get the security patch with your upgrade. More information about the switch can be found at Apple’s website

If you missed Apple’s iOS 15.2 update, you’ll get the 30+ security patches with your upgrade. You can read all about it on the company security site

iOS 15.2 also included some significant privacy upgrades. The software brought the company’s app privacy report to Settings. This lets you see how many times your apps accessed your location, photos, camera, microphone, contacts, and more in the past seven days. You can also see their network activity.

In addition, iOS 15.2 Apple’s communications security features for children. You’ll find these features in the Messages app, Siri, Spotlight, and Search.

If you missed iOS 15.1, iOS 15.4.1 will bring the security patches to your iPhone. You can read more about it at Apple’s website

If you missed iOS 15.0.2, you will also get the security patch with your upgrade. You can learn more about it here

iOS 15.0 also brought numerous security patches to your iPhone. If you’re moving from iOS 14 and you’re interested in the exact nature of these improvements, you can read more about them at Apple’s security website

Apple has updated its website with new information about iOS 15’s suite of security patches. The company now says the software has fixed an issue that could have exposed a user’s personal Apple ID information and in-app search history. It also states that iOS 15 has fixed an issue that allowed apps to override privacy preferences.

If you skipped iOS 14.8 or an older version of iOS, you will also receive the security patches from those updates with your iOS 15.4.1 update.

In addition to these patches, iOS 15 comes with some security and privacy upgrades, including improvements to Siri. Requests to Siri are now processed on the device itself with Neural Engine. This makes it safer.

If you are an Apple Card user, you now get a security code that changes regularly to use when making online transactions.

Apple has also added a built-in authenticator similar to Google Authenticator. Allows you to generate verification codes for enhanced login security under your passwords.

There is also a Mail feature that hides your IP address.

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