After challenging T-Mobile and Sprint for rolling out Wi-Fi calling without regulatory approval, AT&T has announced that it has received the requisite waiver from the FCC. The FCC requires that all carriers offering Wi-Fi calling support teletypewriter (TTY) for the hearing-impaired, but the waiver allows AT&T to roll out the feature with a newer form of accessibility service called real-time text (RTT).
Full story from the WindowsCentral blog...