AT&T on Tuesday began rolling out support for Wi-Fi calling to some iPhone users running iOS 9 beta 5. The feature was added when that beta was released to developers last week, but testers on the AT&T network are only just now able to activate it.
For those unfamiliar with Wi-Fi calling, it allows iPhone users to place phone calls over Wi-Fi instead of their cellular network. The feature was first activated for T-Mobile in iOS 8, and users have reported better call quality and improved battery life.