OK, so awhile back I jailbroke my iPhone, had my fun, and went back to non jailbroken. However, the carrier id still stayed modified. I thought this was cool, so I just left it. But now I am wondering about upgrading to the 3G iPhone if I should somehow fix this first. I know if I delete any restore information that it will fix it, but I would like to be able to keep everything else on my phone. Is there an easy way to just get the carrier if back to normal?