Myjapanphone offer Japanese phone rental, blackberry rental.
Japan mobile phone is WCDMA, 3G phone can use in japan but airtime is very expensive.
you can choose purchase prepaid phone or choose rent a mobile phone.

Winter Promotion

Rent one cell phone or BlackBerry, get another cell phone rental Free!(www.myjapanphone.com)
To provide our customer with unbeatable service, we launch our new winter promotion, if you rent a cell phone from us, you or your partner could get another cell phone rental for free. It means you just need to pay the airtime fee and handling fee for the second cell phone. You will get much more benefit if you go to Japan with a group. This promotion will be available during November 1st 2007 and February 15th 2008.