A better question is, who doesn’t?
Well now you can unlock your 1.1.1 iPhone with iPhoneSimFree.
I haven’t heard of anyone trying it yet but I would assume that it does work. After the last update, with all the bricking and all, I don’t really know of anyone who would try it.
Like the jailbreak (which iPhoneSimFree needs so that it can be installed) I am not telling you that you should and I don’t think anyone should unlock their phone, if you want an unlocked phone, buy a different phone.
But, if you love to hack things for the fun of it and have a lot of disposable income I guess you are going to try it anyway.