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cellsafemode is correct -- the A-pillar hole is the voice mic. It is well documented because of issues with bad windshield sealant causing lots of noise in the pillars that make it impossible for the system to understand you on the highway (and your calls sound like crap too).
People have used 3 methods to defeat the ANC mics: unplug the mic in the doors, unpin the mics from the harness & cut the mic wires. I have not seen anyone else complain about losing the voice mic when doing any of these 3.
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