Unable to Connect to OnStar Message
If there is limited cellular coverage
or the cellular network has reached
maximum capacity, this message
may come on. Push 
to try the
call again or try again after driving a
few miles into another cellular area.
See also:
Windshield Washer
(Windshield Washer): To
spray washer fluid
on the windshield, press the windshield washer
paddle. The wipers will clear the window and then
either stop or return to your preset speed.
CAUTION:
...
Receiving a Call
When an incoming call is received,
the audio system mutes and a ring
tone is heard in the vehicle.
• Press to answer the call.
• Press to ignore a call. ...
To Transfer Audio to the In-Vehicle
Bluetooth System
The cellular phone must be paired and connected with
the Bluetooth system before a call can be transferred.
The connection process can take up to two minutes after
the key is turned to the ON/RUN ...