But if the phone has never left your area of trust during that time, there's no problem. If the phone has, then force a reboot of the thing before typing in your PIN. Say you have to walk into a place that demands you relinquish your personal device, but when it is returned to you it requests your pin. The suggestion here is that you reboot your phone to help ensure this jailbreak wasn't done to you. It seems like a simple thing, and fairly painless in this case. Just because you're paranoid doesn't mean...