2008 Mercedes C-Class Owner's Manual - Page 226

Controls in detail Audio system Functional restrictions You will not be able to use the telephone, or you may have to wait a while, in the following situations: If the telephone is switched off. If the telephone is not connected via the Bluetooth® interface to the audio system. The telephone must not be locked. If the telephone has not yet logged into the network. The telephone automatically tries to log into a network. If no network is available, you will also not be able to make a "911" emergency call. If you attempt to make an outgoing call, the No Service message will appear for a short while. If you switch off the audio system in the middle of a call, e.g. by switching off the ignition, that call will be cut off. You can prevent this from happening as follows: Switch the phone to "private mode" before switching the audio system off (see telephone operating instructions). Activating the telephone Prerequisites for the telephone For making calls using the audio system via the Bluetooth® interface, you will need a Bluetooth® enabled telephone. Before attempting to make or receive calls via the Bluetooth® interface, check your phone's hands-free profile. It must support version 1.0 or higher (see telephone operating instructions). i Not all telephones on the market are suitable. Further information on suitable telephones and on connecting Bluetooth® enabled telephones to the audio system are available from an authorized Mercedes-Benz Center. 225