OnStar is also known as OnStar On Star Onstar.com About OnStar OnStar CANCEL GUIDES Get together the following account information: First Name Last Name Date of Birth Email Address Phone Number Billing Address City State/Province/Region ZIP/Postal Code Country Last 4 Digits of Card Account Number Reason for Cancellation The amount you are being billed monthly 4 digit PIN code on account Dealership of Purchase Make & Model of Vehicle Phone (Live Agent) Follow these steps: Call 1-888-466-7827 Request that the agent cancel your account Request that you be given a refund Request that the agent provide you with a confirmation … Continue reading How to Cancel OnStar