So I'm in Tokyo, I paid ATT for a roaming plan while I am here, and I can't seem to make calls at all. If I just dial my number back home, I get some Japanese woman talking to me (automatic voice) and I have no idea what she is saying. If I try international prefix codes, I get nothing. I'm dead in the water while my colleague happily makes calls on her blackberry to home. What is the magic sauce to using iPhone overseas like this?