In my VW, the cellular modem and something I actually use (I think it's the Bluetooth microphone) are in the same module, so pulling the fuse or disabling it in the CAN gateway would be too heavy-handed. I would need to spend hours getting to, and into, the module. Or maybe replace the antenna with an effective dummy load / terminator? Tons of trim work. Luckily it's old enough to be 2G, and my understanding is most towers no longer speak to it, so I haven't pursued it further.