This is super annoying and I am hoping that you guys have a fix for this! I have a cheap, yet effective Bluetooth Adapter that I got from Amazon. When I try to use Siri for anything, I will speak into my iPhone mic to talk to siri and notice that it is trying to use the Mic on the bluetooth adapter. I have to bend way down while driving and try to speak into it and it never works. Is there a setting where I can choose for the car to use the regular iPhone mic while connected to the Bluetooth adapter? Thanks guys!
The setting you want requires owning the Apple Watch. You can have your iPhone connected to a Bluetooth adapter in your car and use Siri on your Watch to control your iPhone.