Yes, it is possible to add an authorized user to an AT&T Universal Card account. An authorized user is someone who can make purchases on your account and access your credit line, but they are not legally responsible for the debt incurred on the card. To add an authorized user, the primary cardholder typically needs to provide the authorized user's personal information, such as their name and Social Security number. This process can often be completed online through the account management section of the AT&T Universal Card website or by calling customer service. The primary cardholder should keep in mind that adding an authorized user may impact the credit utilization ratio and overall credit score for both parties. It is always a good practice to review the current policies and guidelines regarding authorized users on the official AT&T Universal Card website for the most accurate and updated information.