Using iPhone to make calls while in Japan

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?

Did you get international provisioning ACTIVATED on your account BEFORE you left? If not, call AT&T, obviously from another phone:
1-800-331-0500
That's AT&T's international provisioning verification & troubleshooting number.
Since you're abroad, sorry, use this number:
+1-916-843-4685

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