Systems and methods provide two levels of authentication for a user on an IMS-IPTV system. A first level of authentication validates an ISIM card (set-top box) with the network using, e.g., an IMSI comparison. A second level of authentication validates the user through comparing user entered information with information stored on the ISIM card. Additionally, methods for populating security information onto the ISIM card to facilitate the second level of authentication are described.