Volkswagen Golf GTI 2016 Owner's Manual page 98

NOTICE
The system does not support simultaneous Volkswagen Car-Net
and mobile phone calls via the mobile phone package.
When a Volkswagen Car-Net service is accessed through the
3-button module call buttons any calls on a mobile device
connected to the vehicle's mobile phone package will be
automatically disconnected.
Initiating or accepting a call on a mobile device connected to
the vehicle's mobile phone package could end any connection
to the Volkswagen Car-Net Response Center made through
the 3-button module.
Calls on a mobile device connected to the vehicle's mobile
phone package cannot be accepted or initiated during an
automated emergency connection to the Volkswagen Car-Net
Response Center; for example, because an airbag has
deployed.