AT&T delays rollout of Wi-Fi calling feature as it is awaits FCC approval; blasts T-Mobile and Sprint for defying regulationsBack in August, Apple and AT&T started testing Wi-Fi calling in iOS 9 with the release of one of the public beta builds of the OS. However, the carrier ultimately held back on making Wi-Fi calling available for all iPhone and iOS 9 users on its network.
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AT&T delays rollout of Wi-Fi calling feature as it is awaits FCC approval; blasts T-Mobile and Sprint for defying regulations