Apple has made available for everyone to test the beta version of the update iOS 9.2.1. So now not only developers, but also ordinary iPhone and iPad users can download and install the beta version of iOS 9.2.1.
A public beta version 9.2.1 iOS became available after the closed test developers, which started just a day ago. To get access to the beta test via this link by signing in with your Apple ID. Those who have already registered for participation in the beta tests, can upgrade “on-air”.
A beta version for developers has not found any significant visible changes, which suggests that the iOS update 9.2.1 focuses on fixing bugs, improving performance, and other improvements, iOS 9.2, the second major update, iOS 9, which was released a week and a half ago.