Verify Minutes and Expiration
Push 
and say “minutes” then “verify” to check how many minutes remain and their expiration date.
See also:
Rear Vision Camera Location
The camera is located above the license plate.
The area displayed by the camera is limited.
It does not display objects that are close to either corner or under the bumper
and can vary depending ...
Transferring Service
Push to request account transfer
eligibility information. The Advisor can assist in canceling or removing account
information. If OnStar receives information that vehicle ownership has changed,
...
Pairing a Phone
1. Press and hold for two seconds.
2. Say “Bluetooth.” This command can be skipped.
3. Say “Pair.” The system responds with instructions and a four-digit Personal Identification Number (PIN ...