Ok.. Here's the deal. I have the 3G and am a local ATT customer for many many years. No intention of cancelling my contract or anything... I'm pretty bummed out with the whole Netshare deal and that's the only reason I would consider jailbreaking it.. Couple of questions - 1. What's the worst damage I could do to it? Is there a chance that I can effectively 'brick' it permanently or is there always a way to restore a clean firmware to it? 2. What's the difference between restore and DFU mode? I couldn't find a real answer to it except for everyone saying they are different modes. 3. If I have a problem with the phone (say the ringer breaks) in my warranty period, can I undo the jailbreak and take it to an Apple store? Would they detect that I had once hacked it? 4. Does the same answers apply to unlocking it as well (once the unlock is out) or does Jailbreaking and Unlocking change different components of the phone? Thanks in advance. Mak.