As of 2015, free HBO GO activation codes are unavailable. To gain free access to the service, users must subscribe to HBO through a TV provider. Using the TV provider’s login credentials, users can sign into HBO GO online or on mobile devices.
Users are also required to enter a new HBO GO ID when signing up for the service. The HBO GO ID is a display name that users create during the sign up process. Only one account is permitted to each user, with no available guest accounts allowed. HBO GO is only available through some participating TV providers. Subscriptions offer users unlimited access to HBO shows and movies.