OK check out this
http://xdaforums.com/showthread.php?t=2696134&page=80 they have WiFi calling working on s5 port sprint how come it can't be done for t-mobile? Can someone one post the WiFi calling files or let me know all the required files so I can work on this thanks...
Yes, I checked it out and the reason it has wifi calling is because SPRINT added that feature
for the Sprint branded Galaxy Note 3 and soon for the Sprint branded Galaxy S5.
Regardless of the fact that SPRINT recently added wifi calling to their phones it does not mean
that the SPRINT wifi calling can be ported to other brands and or models of phones.
It has nothing to do with Tmobile, Tmobile phones already have wifi calling if you use a
Tmobile branded S5 or Note 3 and a Tmobile NB4/NE6 based stock or custom rom and
an active Tmobile sim card.
None of the PORTED or AOSP roms will have wifi calling if you don't have a Tmobile
branded phone and don't use the NB4/NE6 N900T based custom or stock roms.