On Android there is an option called "Bluetooth tethering - Share phone's internet connection via Bluetooth" . If it is On and you are connected to the car's bluetooth it will have internet access via your phone.
While the car has a sim card already, I can't use it for general purpose apps without a subscription. Only updates, remote control and I suppose telemetry.
I usually opt for choosing a bluetooth tether instead of wifi since I already establish a connection for calls, or music / audio books.
It isn't hard to imagine Android being able to transmit vehicle telemetry via the same means.