<Li> 1958: Modems used for direct connection via voice phone lines </Li> <Li> 1960: Bell Labs conducts extensive field trial of an electronic central office in Morris, Illinois, known at the Morris System . </Li> <Li> 1960's: Bell Labs developed the electronics for cellular phones </Li> <Li> 1961: Initiation of Touch - Tone service trials </Li>

When did the telephone come into common use