Just a day after developers got their hands on the first build of iOS 9.2.1, Apple issued the same software to members of its public beta program for testing.
Members of the Apple Beta Software Program can download the beta over the air through the iOS Settings app, or via iTunes. Interested parties can sign up for the beta program for free at Apple's website.
The software is likely identical to build 13D11, issued to developers on Wednesday. Users are warned that devices updated to iOS 9.2.1 cannot be restored to earlier versions of iOS.
Changes made in the update remain unknown, but the identifier of 9.2.1 indicates that the forthcoming update is likely a minor update with bug fixes and security updates. Apple typically saves new features and major changes for a point-one release.
iOS 9.2 was released to the public last week. It boasts improvements to Apple Music, Apple News, Mail, iBooks, and support for Apple's Lightning to SD card reader.