When the iPhone first came out, I applied one of the early hacks to allow me to use it with T-Mobile. Witnessing all the issues with subsequent firmware nuking modded iPhones, I haven't upgraded the software on it since. As my T-Mo contract is finally up, I'd like to switch to AT&T and get the phone back to a state where I can apply the update software. Can anyone point me to a good source for direction on undoing the use-any-sim process. Unfortunately, I've switched computers and no longer have the bookmark for the site I used for the original process. It was early enough that it was a very manual process. I'm fine with keeping the phone Jailbroken (or not... doesn't really matter) - I just want to get it back to where I can move to AT&T and take advantage of the new software revs. Apologies if this has been covered to death, I wasn't able to find anything pertaining to undoing the sim part. Thanks in advance!