Anyone try Wi-Fi calling on T-Mobile?

[Anijake]

Is it active yet?

 

[CEmajr]

Most likely not. T-Mobile has to implement it first. Probably via a carrier update

 

[SumYoungGai]

Is it active yet?

T-Mobile had a press release about it on iOS 8, but so far I haven't seen anything related to wifi calling anywhere on my phone.
iPhone 5s 32 GB Space Gray on T-Mo with iOS 8b1, if it matters.
The carrier version changed to 16.1.2 though.