Wi-Fi Calling allows you to make and receive calls over a Wi-Fi connection. To use Wi-Fi Calling, you must first activate HD Voice on your smartphone, followed by accepting these Terms and Conditions and entering the U.S. address where you want emergency service sent if you call 911. It is very important that you update your 911 address (which can be done at any time through your device settings) whenever you change your location, since this is the location that will be given to emergency services when you dial 911. You must also have access to the Internet through your device's Wi-Fi connection. If you lose your Wi-Fi connection while on a call, your call may drop. You can disable Wi-Fi Calling by going to Settings and toggling it off.
Any Wi-Fi call made to a U.S. number will be treated as a domestic call, no matter where the call originates. Any Wi-Fi call made to a non-U.S. number will be treated as an international call. Please refer to your service description or FAQs for more information on the use of the Wi-Fi Calling service, including any applicable charges.