AT&T Onstar customer service

As of my last knowledge update in September 2021, AT&T and OnStar were collaborating to provide connectivity services for OnStar-equipped vehicles. If you need customer service or support for OnStar services through AT&T, I recommend contacting OnStar directly, as they would be the primary point of contact for assistance related to their services.

You can reach OnStar customer service by phone at 1-888-4-ONSTAR (1-888-466-7827) in the United States. Keep in mind that phone numbers and customer service processes may have changed since my last update, so it's a good idea to check the official OnStar website or AT&T's website for the most up-to-date contact information and support options.

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