Mercedes-Benz EQB 2022 Operator's Manual page 282

For information on the range of functions of the
mobile radio unit to be connected, see the manu-
facturer's operating instructions.
Network connection:
The following cases can lead to the call being dis-
connected while the vehicle is in motion:
You switch into a transmission/reception sta-
R
tion, 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 into
R
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 a
Mercedes-Benz service centre or at: https://
www.mercedes-benz.com/connect
MBUX multimedia system 279