Mobile

au by KDDI

Japanese major mobile phone company English version.
http://www.au.kddi.com/english/index.html

Vodafone

English language information on their mobile service for Japan including repaid and global roaming etc,
http://www.vodafone.jp/scripts/english/top.jsp

DOCOMO

Japan�fs premier mobile communications company, NTT DoCoMo, provides wireless voice and data communications to tens of millions of subscribers.
http://www.nttdocomo.co.jp/english/index.shtml

PuPuRu

A prepaid mobile ( cell) phone rental service in Japan, using NTT DoCoMo cellular telephones.
http://www.pupuru.com/en/index_en.html

Japan Handy Phone

"Japan�fs Pioneer in Mobile Phone Rentals"
http://www.japanphone.com/