Not sure that's a guarantee. When I worked with some embedded GSM modules, they acted as mini-kingdoms of their own, separate flash, separate baseband processor, CPU, etc, just communicating with the rest via some sort of a serial link (AFAIK the N810's GPS is similar in this regard, it's pretty independent from the rest of the device). To release the lock, you had to either flash the device or execute an AT 'magic string' command (e.g. stuff below the telephony layer).