Apple has enabled its promised Single Sign-On service for all devices running at least iOS 10 or tvOS 10, despite it only previously appearing in the iOS 10.2 and tvOS 10.1 betas. The service is only accessible to users in the United States, with eight providers currently on board: CenturyLink Prism, DirecTV, Dish, GTA, Hawaiian Telecom, Hotwire, MetroCast, and Sling TV. The Single Sign-On allows subscribers of any of these supported providers to log in with the credentials from their cable/satellite account to access content in supported content apps without having to authenticate to each app separately — apps will simply request the user’s permission to access saved sign-on credentials when first using the app. Note that content provider apps will need to be specifically updated by their developers to add support for Single Sign-On as well. Hopefully, now that the feature is live, we see more cable/satellite providers added to Single Sign-On, as the list is relatively short at this time.