I have a Bluetooth receiver in my car for playing music from my phone. It's great for that. But also has a microphone that sucks.
My iPhone 7 automatically pairs with the device when I get in the car so I can listen to music. But when I go to Siri (by holding the home button down -- I don't use Hey, Siri) it is routed through that crappy microphone and therefore never understands what I'm saying.
I finally figured out that I can enact Siri, then click on the little button on the lower right (in the 'Siri View') and be given a choice of what microphone to use. I can go back to internal and all is right with the world. But... then next time I get back in my car it's all reset over to the crappy microphone again and I have to go through the process to get it back to internal.
This is crappy. I like using Siri when I drive and the iPhone's microphone isn't too bad in picking up my voice. How do I ALWAYS keep Siri coming through my device's microphone instead of constantly resetting back to an external Bluetooth one?
Much obliged to whoever has figured this out and willing to share:)