Important: The MMI system must be switched on
Link .
Press the function selector button marked TEL.
Press the control button for Settings.
Turn the rotary pushbutton to Switch on telephone/Switch off telephone and press the rotary pushbutton. The car telephone will be turned on/off.
The car telephone will be turned "on" automatically when the ignition is switched on, as long as it was not switched off separately the last time it was used.
WARNING!
The handset* for the car telephone kit and mobile phones must be switched off in all areas where there may be a risk of explosion.
Note
The car telephone can also be switched off on the handset* Link.