At its WWDC event back in June, Apple promised a new feature called Single Sign-On. This feature allows users to authenticate their cable or satellite subscription with just one entry instead of having to authenticate it each time they add a new app to their device. Unfortunately, there was a delay in rolling out this feature, and it was not a part of iOS 10 back in September. It is now available, but it is still only available for a very small list of providers. More providers will be added over time. To access this feature: on Apple TV; Go to Settings/Accounts/TV Provider/Sign-In; On iPhone or iPad; Go to Settings/TV Provider. There is where you will see if your provider is listed. Here is the current list of available providers.