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:
Hill and Mountain Roads
Driving on steep hills or through mountains is different than driving on flat
or rolling terrain. Tips for driving in these conditions include:
○ Keep the vehicle serviced and in good shape.
...
Fuels in Foreign Countries
Never use leaded gasoline or any other fuel not recommended in the previous text on fuel. Costly repairs caused by use of improper fuel would not be covered by the vehicle warranty.
To check the fuel ...
Using Voice Recognition
For vehicles equipped with the MyLink or IntelliLink infotainment system, see
the separate MyLink/ IntelliLink Features and Functions Guide for more information.
To use voice recognition, press the ...