I've been with T-Mobile for 12 years and just purchased a new phone last week. I don't remember what the settings were on my other phone but I'm 99% sure it was on Wi-Fi setting. What is it with my new phone that is giving me these issues? I didn't have these problems on my old LG phone. I need some advice please. Thank you
WiFi calling is just a method to provide service, when normal cellular technology can not reach. WiFi calling will only work when you are connected to a WiFi connection. So when you are a way from home there is no WiFi available to connect to and the phone will use the network instead. WiFi calling is not necessarily better unless you live in a low coverage area. I hope that helped answer your question.
I wanted to add that you can still connect to other WiFi connections like say at a restaurant and the feature should still work.