What is WiFi Calling?
With WiFi Calling, you can place a phone call if you have a WiFi connection in an area with little or no cellular coverage. Instead of using your mobile carrier's network connection, you can make voice calls via a WiFi network. That could mean using a WiFi connection you have set up at home, or whatever WiFi hotspot you happen to be on when you're out and about, such as at a cafe or library. In most ways, it's like any other phone call, and you still use regular phone numbers.
image courtesy of vodafone.co.uk
All four major US carriers (T-Mobile, Sprint, AT&T and Verizon) and prepaid carrier Tracfone provide built-in WiFi calling. See the carrier-specific links below to find out how to enable WiFi Calling for your mobile carrier.