Hi I have a E220 yr 00.When I bought the car,there was no telephone inside but on the dashboard,when i press on the button for telephone,it says'Telephone option not installed'.
Can anyone help me PLZ

You should be able to link your cell phone to yopur vehicle for hands free operation. I'm not sure how to do this on your car but your cell service provider should be able to help with this.

US cars were wired, but the major components were not installed, I assume it is similar in your case. Your dealer should know, I doubt your service provider would have a clue