Jason van Genderen’s Mankind Is No Island is a sweet and sentimental little film that was shot entirely with a cell phone in Sydney and New York. It's not the first example of cell phone movie-making, and certainly not the last (Spike Lee has recently enthused about the possibilities.) But this one has the distinction of winning $20,000 at last week's Tropfest at the World Financial Center Plaza. Not a bad haul considering the film cost just $57 to make and only used up 3 ½ of Genderen's minutes.