Wi-Fi Calling
Use your Wi-Fi connection to talk and text when cellular coverage is limited or unavailable.
Wi-Fi Calling is turned on as part of the activation process. To use Wi-Fi Calling, you'll need a Wi-Fi Internet connection and a postpaid AT&T wireless account provisioned with HD Voice. Certain restrictions, requirements or limitations may apply. Visit About Wi-Fi Calling or att.com/wificalling for more details.
In this tutorial, you will learn how to:
• Activate Wi-Fi calling
• Make a Wi-Fi call
• Quickly turn on/off Wi-Fi calling
When your phone is connected to Wi-Fi, Wi-Fi Calling is on, and a cellular connection is unavailable or poor, you'll see the 
Wi-Fi Calling icon in the Notification bar to indicate that calls will be carried over Wi-Fi.
Activate Wi-Fi calling
1. Swipe down from the Notification bar, then select the 
Settings icon.
2. Select Connections, then select the Wi-Fi Calling switch.
3. Review the Important Information prompt, then scroll to and select Continue. Enter your emergency address, then select Verify address.
Make a Wi-Fi call
Making a call is the same whether on cellular or Wi-Fi. From the home screen, select the 
Phone app > dial the desired number > select the Call icon. When Wi-Fi Calling is enabled, the Call icon will change to the Wi-Fi Calling icon.
Quickly turn on/off Wi-Fi calling
Swipe down from the Notification bar twice, then select the 
Wi-Fi Calling icon.