Due to unexpected iOS 9.2 Errors Apple decide to release iOS 9.2.1 version for Public usage. Currently iOS 9.2.1 on First beta stage and available only for registered Developers.
Registered Developers can be Download it through Apple Developer Center Website and Public Beta will release soon.
Reasons for iOS 9.2.1 Release
Apple still not provided exact reasons for IOS 9.2.1 Release. However, most probably it should have Bug fixes / New features and New Device performance increase features. However, iOS users had a large number of complaints regarding iOS 9.2 issue and Poor performance. So this would-be main reason for iOS 9.2.1 release.
iOS 9.2.1 Public beta
Exact one day after iOS 9.2.1 Developer beta version, Apple released iOS 9.2.1 Public beta 1 version for Public beta testers. So go to Apple Beta Web site and grab iOS 9.2.1 Public beta version.
Reasons not to Download iOS 9.2.1 Beta
iOS Beta release means Prerelease Software of Apple and it can use both Developers and Public beta testers. However, we not recommended to Download iOS 9.2.1 Beta because of many reasons. Here are the Reasons not to install iOS 9.2.1 Beta.
Beta version may have bugs contents. So once you installed iOS 9.2.1 beta, it can be annoying for Device performance. Even you cannot get Apple help for remove beta bugs. So you should wait for next beta update to remove all issues.
No jailbreak support to iOS 9.2.1 Beta1
All jailbreak Developers not care to release jailbreak tool to beta versions. So if you are jailbroken user, we highly recommended stay away from beta update.
Application not supports
iOS Beta versions not fully compatible third party applications. It is because Apple all register Developers still working with beta version to compatible their Applications. So you will have issues while using third party applications on Beta versions.