I'm sort of a newbie when it come to JB and unlocking, ive done it before, but I'm thinking of buying a jailbroken and unlocked 3gs for travel, and was wondering if there was a way to sync it with my itunes giving the phone all of my contacts and apps i have from my apple ID in iTunes, withought having it update,and losing the jb an unlock, is that possible at all, or do I not sync the phone at all?
Sure. When you connect the new phone iTunes will give you an opportunity to re-associate the phone with your computer and account. If you say yes, all existing apps, music, etc will be removed and then you can add your own.