Crazy as it sounds, I don't think that every car came with Bluetooth capability. I know - a BMW that was originally around $50K - no Bluetooth? but yeah it may be the case.
If you have the VIN for the car, you can find an online VIN decoder to see if the car has a "mobile phone prep", which I think is Bluetooth.
Or - if you press the talking head button on the left steering wheel spoke - and if your car does in fact have Bluetooth, you should hear the car reply "Function not currently possible" or similar. My car has Bluetooth and this happens if I try to use the phone but my phone's Bluetooth is turned off (which I blame on my kid while he was mucking around with my phone) or if I left my phone in the house.
https://www.bing.com/images/search?v...x=2&ajaxhist=0