WiFi Calling lets you make and receive calls over WiFi when there's poor mobile phone signal. Simply connect to a WiFi network and set up WiFi Calling on a compatible phone.
There's no extra charge for using WiFi Calling. All calls you make with it use minutes from your allowance as usual.
Your phone won't automatically transfer from a WiFi signal to a mobile signal, so your call may be cut off if you lose your WiFi signal.
It's not possible to send and receive texts over WiFi.
Find out more about WiFi Calling