2008 Mercedes C-Class Owner's Manual - Page 233

Controls in detail Audio system i If no SIM card is in the mobile phone, with a few types of mobile phones NO SERVICE appears in the audio display. In that case, you only can make an emergency call on the mobile phone itself, without the use of the audio control unit. CDMA network phones Placing a "911" emergency call using audio control unit with the phone unlocked Press h button to switch to telephone mode. Enter 911 using the number keypad on the audio control unit. Press s button. or Press n for dialing to begin. DIALING appears in the audio display while the telephone establishes the connection. Wait until the emergency call center answers, then describe the emergency. Placing a "911" emergency call with the phone locked Placing a "911" emergency call with the phone locked i If the mobile phone is locked, you only can make an emergency call on the mobile phone itself, without the use of the audio control unit. i If the mobile phone is locked, you only can make an emergency call on the mobile phone itself, without the use of the audio control unit. 232