contact us

Phone

1.888.4.ONSTAR (1.888.466.7827)

TTY for Hearing/Speech Impaired

1.888.248.2080

Mail

OnStar Subscriber Services
PO Box 1027
Warren, MI 48090-1027

Payments

Dept #77246
OnStar Subscription Center
PO Box 77000
Detroit, MI 48277-0246