R+B singer T-Pain has proved sceptics at his record label wrong by releasing the best-selling ringtone of 2007. The rapper reveals bosses at Jive Records were stunned when his single Buy U A Drank achieved the feat. He tells Billboard magazine, ''I had people at Jive tell me they didn't believe in my product and let me know that they didn't care too much, but selling 6.7 million ringtones (for Stripper and another single I'm Sprung combined) changed their minds. "As long as someone wants to hear my music, I don't care if it's a ringtone or the album or whatever."