Even toyotas sold today have cellular modems that track your location, it's called "toyota safety connect". There is no obvious way to turn it off either.
if it's put in there with the intent to track you regardless of what you want they'll have provisions to make sure you don't disable it. I.e. not use a SIM card but use an eSIM or CDMA style authentication. Or make the ECU go in to cripple mode if it can't talk to the mothership over the cell connection.
