Japanese Customer: Japan - over 100 million mobile subscribers and rising - Feb 2007

"In February 2007, Japan passed the 100 million mark for mobile subscribers. Effectively this means that the country is fully penetrated with advanced wireless services and only the extremes of society (extremely young, extremely old, extremely poor) are not served by mobile services".



Source: eMarketer,
Marketing to a mobile society
Feb 2007
http://www.emarketer.com/Reports/All/
Emarketer_2000381.aspx?src=report_head_info_sitesearch





Further reading:



Book - Personal, Portable, Pedestrian: Mobile Phones in Japanese Life