[QUOTE=nkedel;28937248]Wifi calls on supported phones, or Digits calls via wifi data, are free to US numbers.
I know this BUT I've had tmo reps tell me I will be charged for wifi calls from Vietnam to the US b/c it is not a roaming country even though the written stuff doesn't make a difference between roaming and non.
So if anybody has actually been in Vietnam and made wifi calls please let me know.