Hey, So i bought an iphone from a friend for $200 and when i put my sim in it, it wouldn't work. I googled up some info and found that it's probably blacklisted. DOEST AT&T BLACKLIST IPHONES IN USA? I've read countless stories about the blacklistings and such in the UK and other countries, but im not sure if they do it in the USA. So my question is, how can i use my own at&t sim in this iphone? I know my friend is the original owner of it, so can he call at&t and un-blacklist the phone? I really need the phone for everyday use and would appreciate help. Thanks.