Airtags work on a hive network, as long as one is close an iPhone, doesn't have to be yours, it will transmit it's location. A guy sent his in the post from up North to London and was able to track it all the way through the Royal Mail network.
You can't turn off the Guest which is really mental considering they can effectively hide the car.Apply airbag, don't they rely on Bluetooth to track (i.e needs to be close enough to the phone to pick up?)Interested If I've got this wrong