To make an order online you will need both the card number and the 4 digit PIN on the back. However, if you no longer have the card contact support at 1-888-716-7994 (Gift Card FAQ's). Have a good a day!
***Please be advised that while I am an employee of Best Buy, I am here on my own time just like yourself. I am here simply to offer insight and information from a regular employee point of view. My comments are my own and not representative of Best Buy Co., Inc. I AM NOT A FORUM MODERATOR; therefore, I cannot look in to order/account information. If you find my posting helpful, please add kudos to it. Remember to mark answered questions as solved if something helped you in order to speed up the answer queue for other customers***