Tap the Controls button up top and select one of the four mic modes under Audio & Video. Again, these are Automatic, Standard ...

Select Done to turn on Voice Control. When Voice Control is on, a microphone icon appears at the top of the screen. With voice control on, Siri is still active as long as the device is connected ...

“Hey Cortana, Disable/Enable Bluetooth” or “turn on/off Bluetooth ... you must enable Voice activation for Cortana, and provide Microphone access to it. You can also open the Cortana ...