There are a couple of ways to manage your OnStar account. The easiest is to visit the Owner Center online, where you can set up an account, tie your existing OnStar plan to an account and so much more. If you need help finding your OnStar account number, you can simply push the blue OnStar button inside your vehicle, call 1.888.4ONSTAR (1.888.466.7827) or check your printed Member card. See more answers to common questions here: https://www.onstar.com/us/en/support/
