The entries in the telephone directory of the mobile phone cannot be changed permanently via the telephone control. A telephone number stored in the telephone directory on the mobile phone can only be modified for calls from the vehicle. You can add a country code 
  The telephone directory entries can be called up in the Navigation system via the Directory menu. 
Searching for an entry in the telephone directory 
 
Fig. 235 Telephone directory. 
 
Fig. 236 Search window for selecting a telephone directory entry. 
 
 
 
Function   With the ignition switched on  
Vehicles without Park 
Distance Control  
Vehicles with Optical 
Parking System  
Switch on the 
display 
automatically:  
Shift into Reverse (R)  
Mode 1 is displayed in the factory-installed radio or naviga-
tion system ⇒ fig. 285.  
 Additionally, the mini-OPS 
will be displayed on the left 
edge of the factory-installed 
radio or navigation system 
screen.  
Switch off the 
display 
automatically:  
Turn off the ignition  
OR: Drive forward faster 
than about 9 mph (15 km/h), 
or longer than about 10 
seconds.  
OR: Immediately after shift-
ing out of Reverse (R).  
OR: about 10 seconds after 
shifting out of Reverse (R).  
Hide the 
Rear Assist 
display:  
Press one of the factory-installed radio or navigation sys-
tem buttons or tap the  O function key.  
The display will hide after about 10 seconds.  
 OR: Tap the function key •.  
 The OPS will be displayed 
full-screen.  
Show the 
Rear Assist 
display 
again:  
Shift into another gear position then back into Reverse (R).  
 OR: Tap the function key 
 Z.