The idea of movies made specifically to be viewed on cell phones is still a hard sell to many in Hollywood. But there is no question that some of the shorts being produced for the tiny screen are of extremely high quality, and many are counting on mobile movies to be the next big content boom. “This week at the San Francisco International Film Festival, 20 movies made for mobile devices with 2-inch-by-3-inch screens will be shown as part of the festival’s Pocket Cinema program.”