While WiFi calling isn’t exactly new technology, it was only in iOS 8 that Apple finally introduce the feature to their devices. At the moment only T-Mobile and Sprint customers are able to use the feature, although AT&T has promised to enable the service as well, and interestingly enough it seems that they have with iOS 9.
According to MacRumors, they have heard from their readers and forum members that for some iOS 9 users, it seems that WiFi calling has been enabled for them as you can see in the screenshot above. However like we said, only some users are reporting the feature has been enabled, suggesting that AT&T might be limiting the service to a few customers as a test ahead of its launch.
Unfortunately there is no word on when AT&T will launch the service for iOS users, but the fact that it was found enabled in iOS 9 is pretty encouraging. iOS 9 is currently in beta and has been scheduled for a fall release, possibly alongside the release of the new iPhones. It has been speculated that is when AT&T’s iOS WiFi calling feature will be activated as well.
However until we get the official word from AT&T, we suggest you not get your hopes up just yet. MacRumors claims that one of their readers who is an AT&T employee has stated that his store has yet to receive any instructions with regards to the feature, so like we said, perhaps there is still a few weeks/months until its release.