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> The EU has already mandated this.

Are you thinking about eCall? That is only supposed to be activated during an emergency.

https://europa.eu/youreurope/citizens/travel/security-and-em...

If communication module is mandatory even only for emergency, it makes easier entire car to be connected.

The EU requires the module to be powered off except in an emergency. So it's not in contact with cell towers all the time, except when it needs to make an emergency call. It's easy enough to detect the transmissions with simple hardware.

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