Well Glad to say the new July update, it now has VoLTE!! There is now an option under Mobile Networks for VoLTE. And it works!
One strange thing though now instead of it showing Verizon, as the network it shows "Roaming Indicator off" which its not roaming. But just glad to VoLTE now works!
Another note: This T-Mobile update doesnt show avalible yet online? but yet it updated.