Wifi Calling - Global Calls is a free app available on the Android platform. The app allows users to make voice calls to friends and family around the world without incurring any fees. It also offers a unique feature where users can enable WiFi Calling, which allows free voice calls over the internet without any carrier charges, including cost-per-minute charges.

The app works by using a Wi-Fi network rather than the carrier's network connection, making it a great alternative for those who want to save money on long-distance calls. The app is easy to use and comes with a Settings feature that enables users to enable WiFi Calling. The app also allows users to report compatible and incompatible phone models and incompatible phenomena, so the developers can further improve the app.

Overall, Wifi Calling - Global Calls is an excellent app for those who want to make free voice calls over the internet without any carrier charges. It is a great alternative to traditional long-distance calling plans and is definitely worth trying out.