Originally Posted by
CPH-Flyer
There are any number of apps that can use WiFi for calls. The important part is that the caller uses the same app. My go to app is WhatsApp, as it is platform independent, reliable, and simple to use.
We used WhatsApp and Google Voice, both worked well. When we made a mistake and didn't use Wifi the Verizon charges were astronomical, so you need to be careful.