Blood Cell (2009)

Julia is jolted awake by the howl of her cellphone; a video message from her best friend, Susan. Her eyes are swollen from crying. Her upper lip shows a painful cut. And she's scared to death. "I've been kidnapped... You can't call the police... And don't turn off your cell phone, he'll kill me if you do. Just wait for my next call and I'll..." And as the shadowed figure of a dark, ominous man fills the frame, Susan screams and the message cuts out. Confused, Julia receives a text message from the kidnapper: "Dead Cell = Dead Friend." A peaceful night turns into a race against time. Together with her friend Alex, Julia becomes part of a cat and mouse game with the mysterious kidnapper. Using Julia's cellphone as the only lifeline, Julia and Alex must rescue her friend and avoid succumbing to a similarly gruesome fate.