Every account has a passcode. With wireless accounts, you can use it when you sign in as an extra layer of security. Forget your passcode? You can reset it.
About passcodes
A passcode is like a numerical PIN, and you use it for a specific account. It's usually four digits. You can use a passcode to add an extra layer of security to a wireless account.
You, or someone you authorize, may need your passcode when:
Calling AT&T Customer Care
Managing your account in some retail stores
Signing in, if you’ve chosen extra security (wireless accounts only)