Ringback Tone Facts
The number of mobile subscribers who reported purchasing a ringback tone increased 69% from February 2007 to February 2008. However, neither ringtones nor wallpaper images could keep pace with the overall market growth, increasing by only 4.3% and 6.2%, respectively, in the same time frame." M:Metrics.
Ringback Tones are catching on and becoming the hottest thing in cellular.