It’s not inconceivable that the car could use a BLE connection with the app to be unlocked and started, at least as a backup when it can’t reach a cell tower.

It’s not inconceivable that the car could use a BLE connection with the app to be unlocked and started, at least as a backup when it can’t reach a cell tower. Having no mitigation at all for the car not reaching the Internet on its cell connection is negligent. Even a hidden screen that lets you put in a one-time use startup code in the case of emergencies would have helped.