AT&T mentions in their FAQ that only those in an HD Voice coverage area will be able to move outside an active WiFi connection while on a call and not have it drop.
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You’ll then have to enter in an emergency address in case you’re ever in need of assistance.
Wi-Fi calling is a feature that lets calls be placed over a wireless connection when cellular connectivity is poor, functioning much like an AT&T M-Cell does now.
Starting on Friday, users of U.S. Telecom carrier AT&T can make and receive calls using a Wi-Fi network as long as the handsets are also running Apple’s latest mobile operating system, iOS 9.
Once the setup process is complete, customers are receiving notifications letting them know the Wi-Fi calling feature will be available after a short activation period.
Last week the carrier accused the FCC of dragging its feet on approving the waiver it needed to offer the feature.
Wi-Fi Calling is easy to set-up and, in most ways, making a call over Wi-Fi is a lot like a regular phone call, AT&T said. The carrier finally received clearance from the FCC on Tuesday.
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You don’t have to use or log into any separate apps.
