... for my mobile phone. In October 2005, KDDI (who also operate au) acquired the Tu-Ka Group. In June 2006, Tu-Ka stopped accepting new subscriptions. On October, 24th, Mobile Number Portability (MNP) was introduced in Japan, shortly after that I got an email from Tu-Ka offering me to switch to a new au phone while keeping my number (even on my prepaid service). This week, KDDI announced the cessation of all Tu-Ka services for March 2008.