Wi-Fi Calling allows you to make and receive calls over a Wi-Fi connection. To use Wi-Fi Calling, you must first activate Advanced Calling on your smartphone. 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.
Charges. Any Wi-Fi call made to a U.S. number will be treated as a domestic call, no matter where the call originates, and will not count against your calling plan, except for calls made to premium numbers such as 411. Any Wi-Fi call made to a non-U.S. number will be treated as an international long distance call and will be billed in accordance with your international calling plan. If you do not have an international calling plan, you will be charged the applicable standard long distance rate for the location called. International long distance calls are routed through the U.S. and subject to U.S taxes, fees and Verizon surcharges.