The Black Phone (2021), directed by Scott Derrickson and based on a short story by Joe Hill, is a supernatural horror thriller set in the late 1970s. Starring Ethan Hawke as a masked child abductor known as “The Grabber,” the film follows a kidnapped boy who begins receiving mysterious phone calls from the killer’s previous victims. Blending psychological tension with supernatural elements, the story explores fear, survival, and resilience within a confined setting. The film was produced by Blumhouse and became a critical and commercial success.

Från IMDB:
After being abducted and locked in a basement, a boy starts receiving calls on a disconnected phone from the killer's previous victims.