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Hong Kong action thriller based on the 2004 film 'Cellular'. Louis Koo stars as Bob, a debt collector who receives a call on his mobile phone from Grace (Barbie Hsu), an unknown woman who claims to have been kidnapped by a vicious gang. At first he suspects that the call is a prank - but after conducting a few cursory investigations he becomes convinced of her plight and recklessly rushes off across the city, with all guns blazing, to save her.