I also moved your thread in the appropriate forum. In this forum you can find all of your jailbreakin/unlocking questions. As for unlocking a 3g I'd say no simply because the only method to do so at the moment is a SIMable hack which is not stable and I would not tell my worst enemy to use that. We are still waiting for a software unlock from the Dev Team. And at this point who knows if it is even possible.