Remake of the US movie "Cellular") A single mother Grace was sending her daughter to school when she was knocked down by a car. Half-conscious, she witnesses a brutal murder and is then held captive in a warehouse. The murderer threatens to kill Grace’s family unless she hands over the evidence of his crimes. The helpless Grace manages to repair a spoiled phone and miraculously manages to call Bob, a man working in a finance company. He must now race against time to save Grace and her daughter before it is too late.