Seamless multi-channel TV everywhere sign-in

A network device receives a unique device identifier (UDID) associated with a mobile device belonging to a user, and content channel subscription information associated with the user, and stores the UDID and the content channel subscription information in a database. The network device receives the UDID and a channel identifier (ID) from a content application executing at the mobile device, and accesses the database with the UDID and the channel ID to verify the user's subscription to a content channel identified by the channel ID. The network device sends, if the user's subscription to the content channel is verified, a channel permission and a timestamp, to the mobile device, such that the mobile device is able to access content at a content provider corresponding to the channel ID prior to an expiration time that is based on the timestamp.