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Members of Apple's public beta program were issued a second pre-release build of iOS 9.2 on Wednesday, giving users the ability to test AT&T's forthcoming NumberSync technology for receiving phone calls across devices.
The public release of iOS 9.2 beta 2 comes one day after it was provided to developers. It is identified as build 13C5060d, and devices running iOS 9.2 cannot be restored to earlier versions of iOS.
After iOS 9.2 launched on Tuesday, it was discovered that Apple has included support for AT&T NumberSync, which is essentially a phone number-based version of Apple's own Continuity. With NumberSync, other devices can place calls and texts over Wi-Fi, such as an iPad or Mac, as well as other non-Apple devices as support for the feature expands.
Users running iOS 9.2 beta to can open the Settings app, choose Phone, then Wi-Fi Calling. From there, tap on Add Wi-Fi Calling For Other Devices, agree to the terms and conditions, and Wi-Fi Calling will be enabled for other devices tied to your iCloud account.
The initial public beta of iOS 9.2 was released last week. It's likely that Mac users will also receive a second public beta of OS X 10.11.2 this week.