Wi-Fi Calling ... I need a simple answer (will it work on 6p with T-Mobile service ???)

Please excuse the noobness of this question but any idea if its a limitation of at&t? Or, if its something thats in the works?

At the moment I believe AT&T is testing with the iPhone and will expand. Till then -- AT&T users are out of luck sadly :(.
 
WiFi calling and texting definitely works. I put my phone in airplane mode and tested it. My only question is what setting seems to work better, cellular preferred or WiFi preferred?
 
Cellular preferred means it will only use wifi calling when you're out of coverage but on a wifi network. Wifi preferred means it will always try to initiate calls if you're on a wifi network through the wifi network, falling back to cellular if its too slow or has no outbound route. Neither is "better" per say, all depends on your preference. I tend to stick with wifi preferred, only because unlike project fi, tmobiles wifi calling will not transition from cellular to wifi, only the other way around. As a result, if i walk out of my building at work, while im still in coverage, I transition to the nearest tower, but when i walk back in, the signal can't penetrate and drops the call. With wifi preferred, I stay connected via wifi outside the building (unless i roam too far) and it allows me to continue my call walking in and out as i so choose.
 
I have the $30/100 min/5GB prepaid T-Mobile acct. Are minutes deducted on wifi calls? Do they have to adjust my acct for wifi calling on my unlocked Nexus 6P (once I change the phone settings)?

Edited:
On a 2nd call to T-Mobile I found out wifi minutes get deducted for all of their accounts, and that they have to mark your account as ready for wifi calling. So, still need to make those Hangouts phone calls.

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