I have an iPhone 3G, bought/activated through AT&T, and it's been sitting at firmware 2.2 and baseband 2.28.00 for a while now. I don't have a mac so it's just always been synced to iTunes on my Windows laptop. I haven't jailbroken yet because I'd like to upgrade to 2.2.1 but want the ability to unlock the firmware, and I understand that QuickPwn won't do that with 2.2.1. However I have a friend visiting tomorrow with a new Mac (that is also synced to his new iPhone). I'd like to take advantage of that and run PwnageTool. (I have a Dell monitor with USB hub so that should take care of any potential OS X DFU mode issues.) My problem is my general noobness about syncing an iPhone to multiple different machines. Some of my questions: Do I even need to sync my phone to his mac's iTunes to do the jailbreak? I've read the iClarified guide and it appears that the final step involves iTunes setting up the just-restored-with-the-pwnage-image iPhone as a new phone (or restoring from backup). Should I sync my phone to his mac's iTunes before starting the process? Would I need to log in with my iTunes account info or is that irrelevant? I clearly don't have a good handle on where the iTunes account figures into everything -- is it only for initial activation (if even that) and apps/music/video purchases, or does it also control what computers might be able to sync with the phone? After the pwnage image restore, during that last "set up as a new phone/restore-from-backup?" stage, could I just disconnect the phone at that point and reconnect it to my Windows laptop and do that step from iTunes? Could I even restore from backup to keep my settings, or would that just wipe out the jailbroken 2.2.1 that I just installed and put a backup of 2.2 back on? Is there any possibility of keeping my settings, or will this be as if a complete restore was done? Side note: what root partition value should I choose? Are there any implications to making it bigger than needed? Like future flexibility to install more low-level apps -- or do those just go to the other partition? Sorry for all the rookie questions!