In the first Chinese remake of an American blockbuster, helmer Benny Chan updates the 2004 thriller Cellular, with Louis Koo starring as a single dad debt collector who becomes embroiled in intrigue when he responds to a stranger's plea for help. An out-of-the-blue phone call from a woman claiming to be held by kidnappers sets off a chain of events that will terrify and test the beleaguered man in this action-packed adventure.