When a Stranger Calls is a 2006 American psychological horror film directed by Simon West and written by Jake Wade Wall. The film stars Camilla Belle, Brian Geraghty, Katie Cassidy, Tessa Thompson and Clark Gregg. Belle plays a babysitter who starts to receive threatening phone calls from an unidentified stranger, played by both Tommy Flanagan and Lance Henriksen. It is a remake of Fred Walton's 1979 horror film of the same name, which became a cult classic for its opening 23 minutes, which this remake extends to a feature-length film.

Camilla Belle Routh, known professionally as Camilla Belle, is an American actress. Born and raised in Los Angeles, California, Belle began her acting career with appearances in numerous television commercials before landing her first lead role in NBC's thriller, Trapped Beneath the Earth in 1992. She has since appeared in a variety of films and television shows, including The Lost World: Jurassic Park (1997), Practical Magic (1998), Rip Girls (2000) and 10,000 BC (2008). Belle has also been recognized for her work in independent films such as The Quiet (2005) and The Mad Whale (2017).