iOS 15.3 includes only security and bug fixes.
After a bizarre and erratic beginning, Apple has started its beta test for iOS 15.3. Apple did not announce its iOS 15.3 beta until 17 December, but the most observant people discovered that the page of developers to download the beta contained the entire iOS 15.3 section removed in the HTML.
A few hours later it was made available to developers without reason given for the reason for the delay. There aren’t any new features added in this version, but only security updates and bug fixes.
Update 01/21/22: The beta release Candidate for iOS 15.3 is now available for developers as well as Beta testers in the public realm. The release candidate appears to include just bug fixes and security updates. Usually, the public release is released within a week of it’s release-day candidate.
iOS 15.3: New features
It appears that it appears that iOS 15.3 isn’t bringing any new features for users. The release notes say: “iOS 15.3 includes bug fixes and security updates for your iPhone and is recommended for all users.” It is likely to include a variety of security and bug fix updates, which includes an update to security holes in the Safari 15 vulnerability that can leak your browsing history. 9to5Mac has discovered it was the FingerprintJS tool shows that the flaw was repaired.
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iOS 15.3 How to access the beta version
If you’re interested in testing beta versions of iOS 15.3 (or the iPad OS 15.3) You should test it on a device which is different from your main device of choice iPhone or iPad.
Registered developers can go to developer.apple.com/download using the device upon which they wish to run the beta. There, you can download the beta developer profile. Navigate into Settings General > VPN & Device Management to enable the beta profile. After that, your iPhone and iPad will be restarted and you will be able to navigate into Settings General > Software Update to download the most recent version.
For the chance to participate in the beta test for public participation (which generally receives beta builds that last between a couple of hours and a few days after the developers release) go to beta.apple.com using the device you want to test the beta. There, you can download a beta developer profile. Go to Settings General > VPN & Device Management to enable the beta profile. After that, your iPhone as well as iPad will be restarted and you will be able to navigate into Settings General > Software Update to download the most recent version.