In order to get the funds for my 3g, since I want 16gb, I will need to sell my original iphone right after. I remember trying to jailbreak once, ended up restoring and made my phone as if I just got it, had to register it again and what not. Once I get my 3g and do the sim xfer thing, will the old iphone be of any use? Can I reset it to as if it was not registered to a number and sell it? Or will it be completely useless? Thanks.