List of number one Reco-kyō Chart singles 2006–09

The monthly highest-selling ringtones in Japan were ranked by the Recording Industry Association of Japan from August 2006 until February 2009, on the Reco-kyō Chart (レコ協チャート, Record Association Chart), also referred to by its formal name the Yūryō Ongaku Haishin Chart (有料音楽配信チャート, Paid Music Distribution Chart). The ringtone sales market was the highest certified digital market in Japan at the time.

Source: Wikipedia — List of number one Reco-kyō Chart singles 2006–09 (CC BY-SA 4.0)