Wifi Calling is a free voice calling app for Android devices. It allows you to make voice calls over the internet using your Wi-Fi connection. This can be useful when you are in an area with weak carrier coverage, such as when you are traveling to the residential countryside or you are in a building with spotty reception.

Wifi Calling can also be useful when you are in a location with weak reception. For example, when you are in a dingy, underground bar. You can use this service to call a friend up even if you are in a dingy, underground bar.

Wifi Calling can be used with all four major US carriers (T-Mobile, Sprint, AT&T and Verizon) as well as Republic Wireless and Google Project Fi.