All OnStar support phone numbers are listed below, including customer service phone number(s), Legal support phone number(s), support phone number(s), support phone number(s), etc. You can also get OnStar support via email, social networks, help center, or directly check all the customer service contacts of OnStar.
| Customer Service number | +1 888 466 7827 |
|
Customer Service number
(TTY) |
+1 877 248 2080 |
| Customer Service number | +1 877 865 7864 |
| Customer Service number | +1 866 635 2349 |
| Customer Service number | +1 313 667 3544 |
| Customer Service number | +1 855 440 0400 |
| [Legal] support phone number | +1 866 697 7482 |