The real solution seems to be jamming network signals or removing the transceivers from vehicles. Some manufacturers make this easy (Ford with the transceiver u

The real solution seems to be jamming network signals or removing the transceivers from vehicles. Some manufacturers make this easy (Ford with the transceiver under a seat), and some make it hard (Toyota where you have to pull it from behind the dashboard). I've seem people replace the antennas with resistors so the device thinks it's still working, since Toyota routes part of the speakers through it, so disabling entirely would render some of the sound in your vehicle disabled too.