Problem never happened with iOS 9. Had my 6S swapped for battery problems and this problem still happens on the new device. In my 2009 Ford Fusion with Microsoft Sync you can have media stream mode for Bluetooth audio. During a phone call the radio will display a phone number and the time on the call. Once you hang up the call ends and goes back to media stream. All this works normal. If I activate Siri my iPhone 6S will force the radio into that phone call mode but with my phone number on the display and the time on with Siri. If I close Siri it will end the call. My problem is every time I enter my car now with my iPhone 6S running iOS 10, the radio displays that I'm in a call showing my number and the time on the call. But I'm not in a call and I don't have Siri activated. The only way to end the call is to activate Siri and then close out of Siri. I submitted an issue to apple as part of the public beta and today I updated to the GM but it still does it. I turned off hey Siri. I set call audio routing to speaker. I deleted the Bluetooth profile from my iPhone and from the sync radio. None of these worked.