Locate the "Talk" button on your steering wheel. Press and hold this button for two seconds and say "Bluetooth." You will hear the OnStar system respond with "Ready," followed by a tone that indicates it is ready for pairing.
Say "Bluetooth" loud enough for the system to hear. OnStar will respond, "Bluetooth Ready." Respond: "Pair." OnStar will reply, "Please start a search on your Bluetooth phone." It will also provide a four-digit personal identification number (PIN). Make note of this PIN.
Activate Bluetooth on your cellphone. Check your specific model's user manual for instructions on how to enable your device correctly.
Follow your cellphone's user manual procedure for adding a device via Bluetooth. Select "General Motors" from the available device list. Enter the four-digit PIN provided by OnStar when you are prompted to provide the pass code.
Provide a name for the new connection between the phone and the OnStar system when asked. OnStar will confirm the phone has been successfully paired.