228 MBUX multimedia system
For information on the range of functions of the
mobile radio unit to be connected, see the man‐
ufacturer's operating instructions.
Network connection:
The following cases can lead to the call being
disconnected while the vehicle is in motion:
You switch into a transmission/reception
R
station, in which no communication channel
is free.
The SIM card used is not compatible with the
R
network available
A mobile phone with "Twincard" is logged
R
into the network with the second SIM card at
the same time
The multimedia system supports calls in HD
®
Voice
for improved speech quality. A require‐
ment for this is that the mobile phone and the
mobile phone network provider of the person
®
you are calling support HD Voice
.
Depending on the quality of the connection, the
voice quality may fluctuate.
Further information can be obtained from an
authorized Mercedes-Benz Center or at:
https://www.mercedes-benz.com/connect