Wifi calling?

Hi All

Who has any of the following handsets and have you tried the Wifi calling:

AG Style LAUNCHED
AG Shine OCTOBER 2015
ZTE V6 OCTOBER 2015
ZTE V6 Lite OCTOBER 2015
Samsung Galaxy S6 NOVEMBER 2015
Samsung Galaxy S6 Edge NOVEMBER 2015
Samsung Galaxy S6 Edge Plus DECEMBER 2015
Samsung Galaxy Note 5 DECEMBER 2015

I am holding out my upgrade until I know this technology works. Any feedback would be great?