High Quality Content by WIKIPEDIA articles! "You`ve Got My Number (Why Don`t You Use It?)" is a 1979 punk rock song originally written and recorded by Northern Irish band The Undertones. Written in the summer of 1979 by the band`s main songwriter, John O`Neill, it was released on October 9 that year and reached number 32 in the UK charts. The song was performed on Top of the Pops on 15 November 1979.