July 1, Californians will join many other states and countries in requiring drivers to use handsfree devices when talking on their cell phones. I called Bill using the Jawbone today.
I currently use the BlueAnt Supertooth Light in my car. It has its own speaker and mic and attaches to the visor. It works pretty well, although I can't vouch for what it sounds like to my callers.
Another system that requires no installation but uses your car speakers is The Tooth Pik.
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