I think it is but what do you guys think? I literally found an iphone 3G while trying to get the mail at my apt complex. At first i didn't know what it was until i kicked it over, and that's when i realized it was an iphone. The sim card was still in the iphone, i was able to remove that card and replace it with my card. At first it didn't work because it was passcoded, so i reformatted the iphone to 3.1 and i was able to get my sim card working. I used many different att sim cards and and they all worked. I can't find anyone with a non att sim card. So from this information does it seem unlocked?