Create an animated video for a mobile app

We need roughly a 3 minute, 1 minute and 30 versions of an animated video to show the functionality of a mobile app. We would provide the basis of the app, functions and steps we want to highlight. We would want to see a storyboard or similar before starting to be sure we are all on the same page. A few good examples of what we are looking for: [login to view URL] [login to view URL] [login to view URL] We have 3 projects that would also be good for videos, so depending on quality and relationship there would be alot more work.