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Rohiggidy I roll with you but you spewing out wrong info. Let me educate yall on T-mo Wi-fi calling. It is NOT simple app that can just be hosted on the Play Store. It is a system app that requires changes to the system level of the os to work. It is not like the VOIP apps like Grooveip or Talkatone. Those apps have lag and work just over data while T-mo Wi-Fi App is data only to the internet then routed to T-mo servers back into their cellular network. That is way it performs so much better.
If you have a dead zone in your home sometimes T-mo will provide a cell station that you can hook into your wi-fi to extend your coverage at home.