No, most units have GPS and won't work out of their coverage area. I'm not sure what will happen if you authenticate it inside the Verizon area and then relocate it to Mexico outside of GPS range (e.g. an indoor closet). I presume that the change in IP addresses will force you to reautheticate. Someone will probably hack this, but I would definitely lock my service. It would be flat out rude to make people in Mexico CIty start roaming on Verizon.
