There is a guy who wants to sell an iPhone 3G to me, but he said that it's locked up from SIM LOCK (not the passlock code). He doesn't remember it and that's what I'm here to ask: How can you get rid of the SIM LOCK? There isn't any warranties that come with it. I also want to know what exactly is sim lock? Does that mean that it's locked for their sim card, but if I put mine, I could still use it? Really curious and I'm really interested in buying, but I just wanted to make sure first. Thanks for reading my post. I really appreciate it!