KDDI has reported hitting 50 million full-song downloads as of May 20 2006. The service launched in November 2004 and passed the 10 million mark 6 months later. There are an estimated 80 mobile music stores selling full-song downloads with a total of over 150 thousand titles to choose from. As of November 2005 there was approx. 5 million KDDI customers with full-song download capable handsets in Japan, currently there are about 35 compatible models, including the most recently announced 7 new phones.
Impressive sales volume, at 300jpy per download, considering the limited number of enabled handsets. Looking at the increasing growth curve it will be interesting to see how much longer before they hit 100 million!