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I've always used this with Andriod Auto so I can't confirm 100% but the OEM BMW mic seems to still be used for calls as my call quality never changed when I installed this. I believe to use Andriod Auto voice commands it used the phone's mic. I do know there is no additional mic to install. The wiring harness in the back is all you have to plug in for the sound to come through the aux. No need to run the wire to the center console. No noticeable difference in sound quality when running through Android Auto or the OEM radio. Let me know if you have any additional questions.
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