Hi, I know this has been discussed in the past, but I've read some of those threads and they didn't really help me. Warning I'm a bit of an iPhone noob, even though I've had one for almost 2 years, I've never really played with it or hacked it or anything and don't know how to unlock or jailbreak or do anything like that. Have never attempted any of the above as I'm scared I'll break something! Anyway I have an original iPhone 2G which I bought in HK. I got it unlocked and it has worked fine for two years no matter what country I'm in (I live in Australia). Anyway now I want to sell it. However there's a few things I want to do. 1) I want to delete everything I have on it. So that none of my personal files etc are on it. hopefully then it will appear as it was when it was brand new. 2) I do not want to lose the unlock. I do not know how they unlocked it as almost 2 years ago I just paid a shop to do it and they did it for me. I know it was a software unlock of some sort. As I said, I've never updated it or anything and so it's still Version 1.1.2 (3B48b). Whatever that means. 3) If it is not possible to keep the unlock, what is the easiest and most foolproof way I can unlock it so that it still works internationally and with any SIM etc? 4) Should I upgrade it to the newest firmware or whatever? Will this increase the sale price/make it more desirable? How would I go about to do this? Or should I just leave it how it is? Thanks for any help that you guys can give me. I really appreciate it! And remember I'm a noob and don't know how to do anything! So if appropriate, I'll need full program names and simple to follow instructions! I use a Mac but if needed I have access to a Windows PC also Thanks again for any info u can give me!