Name: When Michael Calls
Director: Philip Leacock
Genre: Horror, Halloween Horror
Released: 1972
Rating: 5.474

Synopsis

A woman begins to receive ominous phone calls from her nephew, who died 15 years earlier. With each phone call, a family member dies. Will she be the next in line?

Helen Connelly is a woman whose nephew Michael died 15 years earlier. She is separated from her husband, Doremus. She is close to Michael's brother, Craig. When mysterious happenings began taking place and she begins receiving phone calls from the supposedly dead Michael, Helen begins to wonder if Michael is really dead or if she is losing touch with reality.

Summary adapted from TMDb and Wikipedia sources.