Read more at ned.sudduth.org
How to activate Wi-Fi Calling on iOS 9
Now you can place a phone call in an area with little or no cellular coverage.
Learn how to make a voice call using Wi-Fi Calling. This also means you can stop using your AT&T micro-femto-small cell, as soon as the FCC approves it.
You need an iPhone 5c, iPhone 5s, iPhone 6, iPhone 6s Plus, and one of these carriers:
- Canada: Bell, Rogers
- United Kingdom: EE, Vodafone
- United States: AT&T, Sprint, T-Mobile
Wi-Fi Calling Setup STEP ONE:
Go to Settings in your iPhone, scroll down to the Phone app.
Wi-Fi Calling Setup STEP TWO:
Tap on Wi-Fi Calling….
Wi-Fi Calling Setup STEP THREE:
Enable Wi-Fi Calling by tapping on the toggle button.
Wi-Fi Calling Setup STEP Four:
Tap on Enable….Read more at ned.sudduth.org
Wi-Fi Calling Setup Failure:
If you get this error, AT&T has not activated Wi-Fi calling in your area yet.