KDDI has been busy subscribing new customers since number portability services took effect in Japan last October. [1] KDDI has subscribed some 1 million net new subs since the services launched. Release [2]
Links:
[1] http://www.fiercewireless.com/story/japan-enables-number-portability-churn-ensues/2006-10-25
[2] http://www.fiercewireless.com/press-releases/press-release-kddi-continues-see-strong-growth-customers-choosing-mobile-number-porta