I have a T-Mobile connection. I wanted to enable Wifi Calling since the network service of T Mobile is very poor. How can I do that? I am able to turn on wifi calling by activating the hidden switch, but it doesnt turn ON the feature and while revisiting the setting it again shows OFF.
You, I, and a whole lot of other people have this issue with the Moto-g. There are a bunch of threads around the web about this. I used wifi calling with my old phone (LG Optimus) on T-Mobile / MetroPCS and I loved it, especially when I'm out of the country, but the (hidden) WiFi calling setting on the g3 won't stay enabled, even though MetroPCS says I still have the service enabled. The consensus seems to be that only phones purchased thru them are allowed to use WiFi calling. I haven't been told this by the company myself, but a lot of folks say they have.
For now, I switch back to my old phone every time I leave the country. I get a foreign SIM for my Moto, and I use my old phone for sending and receiving US calls via WiFi.
HTH