Depending on your credit score (and time with AT&T) they will provision your account so that you can roam internationally. Assuming you have a sufficient credit score, they will do this provisioning for free.
However, this does NOT unlock your phone. This merely allows you to use the AT&T SIM card while out of the country (and pay the sky-high AT&T roaming rates). Currently, there is NO way to get AT&T to "unlock" your iPhone. I previously got Cingular to unlock a RAZR bought through them, allowing me to use other company's SIM cards while traveling. However, they will NOT do this for the iPhone (at least for now...)
The only thing you might get from AT&T is roaming but you still have to pay them the big bucks if you keep the SIM card in $$hi all
is it true that i can pay extra money for international unlock from AT&T ?