iphone stuck in activation screen

[cake90036]

Can someone help me get out of this screen. I have a 3g 16gb iphone that i bought off of some guy the other day and I went to restore it and when I put my sim card in it said sim card not valid (I have att). Anyways I need to get out of this screen. ALso, I already tried bringing it to the apple store and they said they cant service it because it was purchased out of the country!!

 

[Moi un Mouton]

Well, if it's an out-of-country iPhone, then it won't work with att, as you've discovered. It's locked to the other country's carrier.

So you need to unlock it.

Check out this page and choose the appropriate tutorial for your phone and computer; http://www.iclarified.com/entries/index.php?caid=2&scid=11&seid=1

For background info on unlocking iPhones, check the stickies in this forum.