People have started identifying and pulling the fuses on vehicles' cell radios. I would also be interested in digging down to the radio itself and replacing the antenna with a dummy load.
That may create a parasitic battery drain if I radio is constantly seeking connection to a cell tower and not finding it. Subaru experienced a similar problem with their StarLink service after the 3G network shut down, car batteries started draining while trying to talk to towers that no longer existed.