It's best to have at least 2 GB of available space for a feature length (90 minutes) movie. If you run out of space, you can delete movies or TV shows from the app and re-download purchased content up to 5 times.
To check available storage on your iPhone, iPod touch, or iPad:
-Launch the Settings app
-Choose the General tab
-Choose the About tab and scroll until you see the Available option.
To check available storage on your Android device: