It's being reported that after publicly calling out the FCC last week, AT&T received a regulatory waiver on Tuesday that will allow it to begin rolling out Wi-Fi Calling services on Apple's iPhone. AT&T had planned to offer calls over Wi-Fi last month in conjunction with iOS 9 but those plans were held up. The FCC requires that call services provide support for the hard of hearing under TTY rules so AT&T requested a waiver for those rules back in June. A 45 day comment cycle came and went with no negative comments, yet the FCC didn't grant the waiver until now. Source

Look here more on the iPhone 6s Wi-Fi Calling feature.

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