Don't Hang Up is a 2016 horror-thriller film written by Joe Johnson and directed by Alexis Wajsbrot and Damien Macé.

[2] The film stars Gregg Sulkin,[3][4] Garrett Clayton,[5] Bella Dayne, and Sienna Guillory.

Jeff, who delivers the pizza from the shop where he works with Sam's girlfriend Peyton, becomes upset with his friends for involving him in the prank.

A mysterious man who identifies himself as Mr. Lee begins repeatedly calling the boys, insisting that they do not hang up on him.

Sam and Brady are initially indifferent until Mr. Lee reveals that he knows their names, addresses, and intimate details of their lives.

Video footage he sends them reveals that Mr. Lee is holding Brady's parents hostage at the Mannion residence.

A video feed shows the masked Mr. Lee suffocating Roy to death with a plastic bag tied around his head.

A clue of a child's image and the name Izzy leads Sam to check a previously ignored social media friend request.

When the four boys previously called Mrs. Kolbein, she dropped her phone and didn't hear the revelation that she had been pranked.

Still convinced that there was an intruder in the house, Mrs. Kolbein grabbed a gun and accidentally shot her daughter Izzy.

It's implied that Mrs. Kolbein and the young girl were Mr. Lee's wife and daughter, and he wanted to avenge their deaths.