[UPDATE: Works over Cellular too] iOS 9 adds Wi-Fi Calling with Mac/iPad Continuity for T-Mobile customers
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UPDATE: We got an email yesterday from T-Mobile to confirm that this is in fact just part of the story. T-Mo is the first carrier in the world which will support Continuity over a cellular network. So you can leave your phone anywhere, and still receive and send SMS messages or make/receive phone calls. Sweet deal. With … [read full article]