Hands-Free Calling
1. Push 
. System responds:
“OnStar ready.” 2. Say “Dial.” System responds:
“Please say the name or number to call.” 3. Say the entire number without pausing, including a “1” and the area code. System responds:
“OK calling.”
See also:
Capacities and Specifications
The following approximate capacities are given in metric and English
conversions. See Recommended Fluids and Lubricants on page 11‑12 for more information.
Engine Specifications
...
Call Waiting
Call waiting must be supported on the cell phone and enabled by the wireless service carrier.
• Press to answer an incoming call when another call is active. The original call is placed on hold.
...
California Perchlorate Materials Requirements
Certain types of automotive applications, such as airbag initiators, safety belt pretensioners, and lithium batteries contained in Remote Keyless Entry transmitters, may contain perchlorate materials. ...