The movie starts well with an intriguing opening scene. However, as the su spense build mildly to the middle of the plot, you begin to get excited about what is to be revealed as the cause of the apocolyptic style cell phone signal that has turned most into crazed murderers. However this is never revealed and the ending makes absolutey no sense. John Cusack and Samuel Jackson offer solid performances. However, you can't polish a turd, and this movie and cant be made a diamond with two "A" listers.