Mercedes-Benz C-Class Operator's Manual page 82

Protection against theft
80
i
If the alarm continues for more than
30 seconds, the mbrace emergency call sys-
tem automatically notifies the Customer
Assistance Center. This is done either by text
message or data connection.
The emergency call system sends a message
or establishes a data connection provided
that:
you have subscribed to the mbrace service.
R
the mbrace service has been activated
R
properly.
the necessary mobile phone network is
R
available.