When choosing which cable provider to sign a contract with, you will undoubtedly check the channel guide to see which channels are included in the package to which you are about to subscribe. You may even go a bit further and check to see if includes the HD version of your favorite channels. What you likely will not do is check to see how many channels have allowed the cable provider to access their shows from within an app on the App Store. Despite having a growing number of channels to choose from — 189 channels on average — Nielsen data shows that most homes view just 17 different channels. Using a list of broadcast networks, the 20 most watched cable networks of 2013, and some of the top premium channels, you will find that each and every one of the top 20 networks has an iOS app in the app store.