I have an ATT 9700 that I'm going to unlock and use on Tmobile's network. I want to use the UMA wifi calling on this phone with a Tmobile SIM card present.
My Tmobile business rep told me this was not possible but if I update the software on the phone, I'm hoping it will work.
Anyone know what I need to do to make UMA wifi calling work on an ATT 9700 after its unlocked and connected on Tmo's network?