Taking out the SIM card sounds like a good idea if it's physically possible (i.e. the "sim card" isn't soldered down or integrated into some other non-removable device).
Maybe the sensible thing for most IoT-enabled car owners is to get all the software updates for the first few years as the manufacturer works out all the major bugs, then disable the network when the manufacturer's attention has shifted to the next new thing and drive it until the wheels fall off.
Maybe the sensible thing for most IoT-enabled car owners is to get all the software updates for the first few years as the manufacturer works out all the major bugs, then disable the network when the manufacturer's attention has shifted to the next new thing and drive it until the wheels fall off.