some of the GPS navigation systems have bluetooth for that purpose (just to give another distraction to cause an accident).
There a few visor mount ones. The ear mount one that I've been eyeing is the Jawbone II.
Not sure if it matters but most of the bluetooth stuff only pairs with 1 phone at a time which blows when you have multiple phones to juggle. So if you have a hobby phone with bluetooth, you might want to check the reviews to see if it works with multiple handsets.
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