Hi there, Am thinking of jailbreaking my iphone 3g mainly so I can use it as a modem to surf on my laptop, however I'm told that jailbreaking voids the warranty, however if something happens to my phone and I need to take it back to Apple can I not just let it sync with Itunes thus unjailbreaking and gaining my warranty back?...sounds simple to me but wondered if there is a way apple would know you've jailbroken it?