I just sold my iPhone 2G and bought an iphone 3G off craigslist from someone and it has the new baseband. I have an at&t prepaid sim that worked fine with the 2g but now wont work with the 3g. Is there any way to get sim card to work with the new baseband or am I screwed. I read something about creating a custom profile or something and I need a straight answer! HELPPP!