That's a problem when starting the rental and returning the car. Pickup points should be placed in areas with good reception. But in any case, not being able to

That's a problem when starting the rental and returning the car. Pickup points should be placed in areas with good reception. But in any case, not being able to start a rental is a nuisance. Not being able to use the car once you've driven it somewhere is potentially dangerous. I don't see why the car should need a connection to unlock once the rental has been started.