Callertunes are any tune or a particular song callers can hear when they call a number instead of the default dial tone. With Vi, access millions of tunes/songs, preview the callertunes and set the latest songs as caller tunes. For example, if you set a song as a caller tune for your callers, they will hear that song when they call you until you answer the phone. This way you can add a little zest of your personality for your callers instead of the boring ringing caller tone.