One of the stories in the movie, that is set in 1873, is that Alexander Graham Bell invented the telephone "in his youth". But the first telephone was invented by Antonio Meucci in 1860 and Johann Philipp Reis in 1861, who also called his device "telephone", not Bell as it's stated in the movie. Bell didn't invent THE telephone but A telephone, the Bell-telephone.
Bell said that he sent the first time a sound through a wire, in the 1870s. The very first sound through a wire was made by Philipp Reis in 1862.