We spent four beta updates with iOS 13.3. In that time, we saw fun new features like Communications Limits in Screen Time, an off switch for Memoji stickers in the Emoji keyboard, and new mouse options, among other things. Once Apple made 13.3 available to the public, it was only a matter of time before it began beta testing new software. That software is iOS 13.3.1, and that testing starts today.
Apple released the first version of iOS 13.3.1 at 1 p.m. EST (10 a.m. PST) on Tuesday, Dec. 17, one week after the public release of iOS 13.3. If you're a public beta tester, however, you should note the beta is only for developers. You'll need to download the public beta, which Apple released at 1 p.m. EST on Dec. 18.
The update is too new at this time to report on what feature or changes it may or may not bring to iOS as a whole, but we will continue to add further information to this article as we find it. Just by looking at the release notes for 13.3.1 dev beta 1, it doesn't seem like anything much will surface.
iOS & iPadOS 13.3.1 Beta Release Notes
Update your apps to use new features, and test your apps against API changes.
The iOS & iPadOS 13.3.1 SDK provides support for developing apps for iPhone, iPad, and iPod touch devices running iOS & iPadOS 13.3.1. The SDK comes bundled with Xcode 11.3 available from the Mac App Store. For information on the compatibility requirements for Xcode 11.3, see Xcode 11.3 Release Notes.
There are no release notes for this software update.
To update your iPhone to iOS 13.3.1 dev beta 1, you will need to be a registered developer. You can use the restore image for your iPhone available in the Developer portal (install with iTunes or Finder) or install the configuration profile, then update over the air. If you already have the profile installed on your iPhone, head over to Settings –> General –> Software Update to start installing the latest beta build, or you can wait until it installs automatically if "Automatic Updates" is enabled.