Customers can contact OnStar customer service by dialing 1-888-466-7827; hearing-impaired and speech-impaired customers can call 1-877-248-2080. Drivers can also access live customer support by pressing the blue button on their OnStar devices.
OnStar provides an email contact form on the Help and Support page of OnStar.com. The help page also provides physical addresses for mail correspondence and check payments.
The Help and Support page provides other support tools, such as a field to search an archive of frequently asked questions. The page also has a link to print instruction manuals and request replacement subscriber documents, including proof of subscription and subscriber wallet cards.