you activate it through itunes.

@Shiva87, you CAN unlock your phone completely.
It's been done.

Check howardforums.com or tuaw.com

Unlocking it isn't simple though.
You have to get turbo sim, and you flash a blank sim card with the AT&T sim card and your own sim card.
__________________________
I Love Qatar - http://www.iloveqatar.net <-- Cost of Living, Visas, Saftey Info, Tips on Moving, Facts, Pictures, Videos, and more!