OnStar "Phone Unavailable" voice too loud.

Hotsuma9

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2005 Pontiac Grand Prix GTP Sedan 4-Door - 3800 Series 3 (Silver)

I'm not really sure how or when this happened, but, that darn OnStar voice is VERY loud. And I can't figure out how to turn it down. Or better yet, turn it off. I noticed that when I turn the car off and then open and close the driver-side door, I'm able to use the buttons on the dash that controls the small screen but only for a few seconds. When the car is running and driving, the buttons don't work at all. But how do I turn down / off the OnStar voice that says, "Phone Unavailable"?
 

melsg5

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Have you tried the radio volume control when you hear the message?
 
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