Remember how AT&T begrudgingly promised to add Wi-Fi call support for the iPhone after Apple introduced the feature with iOS 8? It only took until the third iOS 9 public beta for it to show up, so now we only have to wait for the public release, and for AT&T to enable the feature on its cell network.
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T-Mobile has been a Wi-Fi calling supporter all along. AT&T is dragging its feet, but seems to be finally getting on board. Verizon, the ball is now in your court.