1948 film by Anatole Litvak
Sorry, Wrong Number is a 1948 American noir thriller tragedy film directed by Anatole Litvak, from a screenplay by Lucille Fletcher, based on her 1943 radio play of the same title.
The film stars Barbara Stanwyck and Burt Lancaster. It follows a bedridden woman who, while on a telephone circuit, overhears men plotting the murder of an unknown individual. By phone, she tries to contact switchboard operators, police, and others who might help her prevent the crime. Stanwyck was nominated for the Academy Award for Best Actress.
It is one of the few pre-1950 Paramount Pictures films which remained in the studio's library (the rest are currently owned by NBCUniversal).
Plot summary adapted from Wikipedia, licensed under CC BY-SA 4.0.