I had a little problem navigating through the setup on my UK laptop but was given a helping hand from a Japanies friend. Found a local dial up number and of it went. Great!! and nice to have a free ISP that allows POP3
Dial-up user name : freenavi
Dial-up password : freenavi
. Calling from mobile phone : 0565-78-4100, 052-740-4100, 054-659-4100, ...
. Calling from fixed line : (probably same as mobile phone)
* You must enable Calling Line Identity (make your tel number visible to this provider)
* Very good ISP