In developer workflows, "cb" is frequently used as shorthand for callback URLs —the addresses where an API sends notifications or data after a process (like a mail delivery or a transaction) is completed. Summary Table Primary Function Official Resource AT&T iOS Mail Personal/Business email setup on Apple devices. AT&T Support SVB API Programmatic access to banking and transfers. SVB Developer Portal "cb" Likely stands for "Commercial Banking" or "Callback."

You can find step-by-step instructions for your specific device on the AT&T Device Support Page . 2. SVB API (Silicon Valley Bank)

imap.mail.att.net (Port 993, SSL required).

For users looking to set up AT&T email on an iPhone or iPad, the process typically involves using Apple Mail with specific server settings.

Modern iOS versions (iOS 9.0+) use OAuth , which allows you to sign in with your standard AT&T password without needing a "Secure Mail Key".