Originally Posted by
bocastephen
1. yes you can make calls using cellular data - I use their fast-enough HSPDA service to make voice calls using GV/Hangouts Dialer all the time in TW, and it receives inbound calls too
We are referring specifically to the TMO wifi calling function, formerly known as UMA. That requires a wifi signal.
Yes, apps like google voice (formerly grand central), hangouts, Line, facetime, whatsapp, WeChat, etc. can all be handled by cellular data.