The Staple Singers, a gospel group, had a top 40 song in the late 60's or early 70's along the same lines as "The Royal Telephone". (The jest of the songs being you can talk to Jesus in prayer as you would call anyone on the phone) Also Reba McIntyre had a song out a couple of years ago "Why Have'nt I Heard From You" that starts with giving a short history of the telephone. Then there's the rather risque´ "Telephone Man" from the mid to late 1970's.