Using the “Re-dial” Command
1. Press and hold 
for two seconds.
2. After the tone, say “Re-dial.” Once connected, the person called will be heard through the audio speakers.
See also:
Storing and Deleting Phone Numbers
The system can store up to 30 phone numbers as name tags in the Hands&-Free Directory
that is shared between the Bluetooth and OnStar systems.
The following commands are used to delete and stor ...
Horn
Press on the steering wheel pad to sound the horn. ...
Safety & Features
With the top score, Good, in frontal, side and rear impacts by the Insurance
Institute for Highway Safety, the Terrain and Equinox have both been named IIHS
Top Safety Picks. That's commendable, t ...