Using the “Delete All Name Tags” Command
This command deletes all stored name tags in the Hands-Free Calling Directory and the OnStar Turn-by-Turn Destinations Directory, if equipped.
To delete all name tags:
1. Press and hold 
for two seconds.
2. Say “Delete all name tags.”
See also:
Bluetooth Controls
Use the buttons located on the infotainment system and the steering wheel to
operate the Bluetooth system.
Steering Wheel Controls
(Push To Talk): Press to answer
incoming calls, confirm system ...
Hazard Warning Flashers
(Hazard Warning Flasher): Press
this button, on the center of the instrument panel, to make the front and rear turn
signal lamps flash on and off. This warns others that you are having trouble. ...
Passing
More passing distance is needed when towing a trailer. Because the rig is longer, it is necessary to go farther beyond the passed vehicle before returning to the lane. ...