Alexander Grahm Bell invented the telephone. He set up bell labs, and Bell labs helped developed nearly all technologies on which modern computers are based upon like transistors, integrated circuits, C language, mobile phones, cellular service provided. Bell also founded the American Telephone and Telegraph Company (AT&T) in 1885.
His analysis of hearing and speech further led him to experiment with hearing devices which eventually culminated in Bell being awarded in the first US patent for the telephone in 1876. Bell considered his invention an intrusion on his real work as a scientist and refused to have the telephone in study.
He was the creator of groundbreaking work in optimal telecommunications, hydrofoils, and aeronautics. In 1875, Bell developed an acoustic telegraph and drew up a patent application for it.