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Telephone*
Important notes

Also make sure that the air vents are 
not pointed in the direction of the 
microphones located in the overhead 
control panel near the rear view mirror. 
Adjust air vents and/or reduce blower 
speed if necessary. 

A brief disconnection from the cellular 
network is not a malfunction, as this 
can occur when the network switches 
areas. The phone will automatically try 
to sign on to a network again.

If the message 
Enter Unlock Code: 
appears, enter the unlock code to en-
able all telephone functions 
(

page 104). If you do not do so, only 
the emergency call (911) is available.
GSM mobile phone

If the message 
Enter PIN: 
on the 
COMAND appears, enter the PIN-code 
to enable the telephone functions 
(

page 104). If you do not do so, only 
the emergency (911) call is available on 
the COMAND.
In the following situations, it is not possible 
or not yet possible to use the telephone:

The telephone is already unlocked but 
is not or not yet registered in the net-
work.  
The message 
no Serv.
 appears in the 
status bar. The telephone will try to re-
gister into an existing network. If the 
network is available, the telephone will 
be ready for use. 
The above message also appears 

if the network is no longer available 
due to weak signals

if you try to make a call (message 
Service Unavailable
for 8 seconds)

The message 
Activating Telepho-
ne Please Wait
 appears. 
COMAND prepares the telephone for 
use. Select other system functions, e.g. 
radio, by pressing the corresponding 
button or wait until the telephone is ac-
tive.

The message 
Telephone
 
Unavai-
lable
 appears if telephone* is not in-
stalled or a malfunction has occured.
Please contact an authorized 
Mercedes-Benz Center.

The message 
Telephone
 
Not In-
serted
 appears if the mobile phone is 
not inserted in the cradle. 
Please connect the mobile phone.
GSM mobile phone

If the message 
Check SIM Card 
(Emergency Call “911” Only 
Possible With Tel.)

Insert the SIM card into the mobile 
phone (Telephone Operating 
Manual).
Depending on power state of the phone 
it may take up to 8 seconds from phone 
insertion until this message disappears 
(e.g. if a powered-off phone is inser-
ted).