As of 2007 Mercedes had the worst Bluetooth of any car bar none. I do not
know if Mercedes figured it out for 2008.
The cars are wonderful but Mercedes just has no clue about bluetooth.
2007 cars in Mercedes price class should should have benn prewired at the
factory for bluetooth but most were not.
In 2007 the car description would often say the car was bluetooth ready but
that does not mean the wiring was actually in place.
If the wiring is not in place in your car the dealer will probably want
around $1500 to do it, probably will not get it right the first time, and
you still have to buy a separate blue tooth unit to plug into the wiring for
At that point you have Bluetooth, but it really does not work very smoothly
with the majority of bluetooth phones. In fact Mercedes bluetooth stinks. It
does not reliably pick-up on incoming calls nor do the car controls reliably
control most phones. By contrast I have yet to see a bluetooth phone that
does not work reliably with my two year old BMW regardless of phone brand or
You will probably be happier with one of those bluetooth earphones and voice
activation. It will be much cheaper.