Okay so I bought my IPhone last night from craigslist. It's 1G and has firmware "04.05.04_G".. I think that is 2.1? Anyways I bought it off of Craigslist because I do have AT&T, but I don't want the contract extension and to pay for the data plan. I read a little about unlocking the iphone, alot on this site some on others, but I just can't find a straight answer. So if I unlock the phone then I can just put my at&t sim in it and it works? I'm really confused, help would be appreciated. If it does work like I just stated, I could use some help unlocking it too. If not, oh well it makes a nice iTouch.