[{[FaSt SOLve]}] 1-877-709-2985 How do I access my AT&T account? Call Toll Free: 1-877-709-2985,AT&T Customer Support, Go to the myAT&T sign-in page and enter your user ID and password in the appropriate fields. Then select Sign in to access your account. FYI: Signing in on your computer? You can also choose Sign in with the myAT&T app to use the myAT&T app on your mobile device to securely sign in.