Listen to You've Got My Number (Why Don't You Use It!) online. You've Got My Number (Why Don't You Use It!) is an English language song and is sung by The Undertones. You've Got My Number (Why Don't You Use It!), from the album The Undertones (30th Anniversary Edition), was released in the year 2009. The duration of the song is 2:41. Download English songs online from JioSaavn.