"Piange... il telefono" is a song performed by Italian singer and songwriter Domenico Modugno with little Francesca Guadagno [it].
It was released as a single (with a song "L'avventura" sung by Modugno on the other side) in 1975 on Carosello Records.
The film also starred Domenico Modugno and Francesca Guadagno and was also titled Piange... il telefono.
[1] As in the original, the song is built on a melodramatic story, in which a man calls his five-year-old daughter on the phone, but without her realizing that the heartbroken caller is actually her father - as he is the estranged husband of the child's mother, who left him before their daughter was born, six years earlier.
At the end of the song, the man, faced with his wife's final rejection (as told to him by the child), is implied to be committing suicide.