I've gotta agree - I'd assume that it's the bluetooth feature of your phone which connects to the cars....I doubt the cars bluetooth system can access any information on your sim(s) - the phone would take care of the accessing of the info on the sim(s), then just output what it needs to via the bluetooth....en short just using the bluetooth as a 'gateway' - so the cars bluetooth just receives whatever your phone throws at it, so it'd still be your phone making the choices with regards to which sim to use.......???Not in here either I am afraid:
Bluetooth Phone Compatibility - Civinfo Wiki
Not sure how that dual sim thing would work - how can it know which to call out on? But then - how to other bluetooth items connect and work with it?
It is the bluetooth of the phone than connects - not the sim.
Does the car even know which sim is in a phone?
E.g. if I change the sim in my phone does it still connect and work as usual? I think it would work, but I have not tried.