Episodes of "Pretty Little Liars" can be watched on a mobile device through the WATCH ABC Family app. The application is available through the iTunes App Store for iPhones and the Google Play App Store for Android smartphones.
The WATCH ABC Family app allows a user to watch full episodes of shows aired on ABC Family, including "Pretty Little Liars." However, the user must have a TV provider such as Cablevision Optimum or Google Fiber and the related username and password to access the content in the application. This ensures that the user already has a paid subscription to access the shows.