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Message: <blockquote data-quote="bigdogYJ" data-source="post: 21669" data-attributes="member: 11207">If you want Bluetooth audio for phone calls over the factory stereo you can swap in a OnStar box from a 2009ish corvette or I’ve heard the trailblazer also offered Bluetooth phone calls.  You just have to ensure the year you get it from has Bluetooth (there’s a logo on the label of the box) and it’s still on the class 2 data bus.  If so the box is plug and play and factory steering wheel buttons allow you to answer phone calls and initiate hands free calling on your phone.At least it puts some of the obsolete OnStar hardware back to use.  Note this does not allow music to play on your stereo.  There’s a different solution for that but it’s kinda aftermarket-ish. But the phone calls one is more oem like.  If you want more details let me know.</blockquote>