If you have just received your physical card, you may also need to activate it before use. You can do this: My Best Buy® Credit Card: Register Your Card - Citi.com
: Follow the remaining prompts to set up security questions and paperless preferences . Card Activation how to register best buy credit card
Last 4 digits of the primary cardholder's (SSN) . If you have just received your physical card,
: Go to the Citibank registration portal and click "Get Started" . You will need to enter the following details: Full Card Number . Name as it appears on the card . Security Code (3 or 4 digits on the front or back) . how to register best buy credit card