Comment by lnsru
Every new car has a SIM card. Apparently in Europe used for emergency automatic calls. But having SIM card in the car is not mandatory. All the information in other cases is saved in the car. And when you bring the car to the dealership the information is transferred over the wire in old fashioned way. Safest thing is to have an older car without much electronics, that can be repaired outside dealership network. Some cars like a Teslas have very normal cameras filming interior. Apparently to monitor the driver. But who knows.
I intentionally bought a used car with only a 3G network connection, knowing (at the time, almost 3 years ago) it would soon shut down in the US. I smiled at the "Your OnStar will soon stop working" messages, and intend to hold onto it for a good long time.