The Black Phone is a 2021 American supernatural horror film directed by Scott Derrickson, and written by Derrickson and C. Robert Cargill. It stars Mason Thames as Finney, a teenage boy abducted by a serial child killer known colloquially as The Grabber (Ethan Hawke). When Finney encounters a mystical black rotary phone in captivity, he uses it to plot his escape by communicating with the ghosts of The Grabber's slain victims. Madeleine McGraw, Jeremy Davies, and James Ransone also feature in the principal cast.
https://en.wikipedia.org/wiki/The_Black_Phone