Definitely, forgot about that, calls do seem to go via the cars factory Bluetooth system. I can unplug my phone mid call and it jumps to the cars own call screen.

So phone number, duration and possibly caller/contact name would be known by the factory headunit and any other information Bluetooth shares with the connect device.

Probably a stupid question…

What about CarPlay and Android Auto? Is that being intercepted by the car manufacturer?

My basic understanding is Android Auto is pretty much an external monitor for your phone.

Edit: speeling irrers