<Li> 1955: the laying of trans - Atlantic cable TAT - 1 began--36 circuits, later increased to 48 by reducing the bandwidth from 4 kHz to 3 kHz </Li> <Li> 1958: Modems used for direct connection via voice phone lines </Li> <Li> 1959: The Princess telephone is introduced in the Bell System in the United States . </Li> <Li> 1960: Bell Labs conducts extensive field trial of an electronic central office in Morris, Illinois, known at the Morris System . </Li>

The number of phone calls between new york