Hi, I recently acquired an Amercian iPhone 3GS that's locked to AT&T. I have an O2 sim card and O2 are all like "yeah, go for it if it works". So put the O2 sim card in and plugged the iPhone into my laptop and I get a message saying "no, that Sim Card won't work" or words to that effect. After a bit of reading up, I can see that AT&T are just plain stingy and won't unlock their iPhones despite the fact that my phone is effectively a spare from someone who got an iPhone 4 upgrade, so it's not like it's going to be used. I've read up on jailbreaking and understand that's not what I want either. other than that, my reading hasn't shown any real conclusions. So my question is, is there ANY way that I can get this iphone working with my O2 sim card? If there isn't, this phone is going straight on eBay and I'm going back to the dark, bleak world that is Blackberry 9000. Help a brother out and I'll send good vibes your way. Cheers. P.S. - It's currently running iOS 4.0 if that makes any difference.