Thanks for the comments. However, is there any advantage of these other companies over Skype, which I already use with a Japanese 050 phone number? Do they, for example, allow outgoing number recognition? If I call someone on my Skype number, the number doesn’t show on the recipient’s phone.
What I want (and I think it may be impossible without using one of the Big 3) is as follows:
A Japanese phone number which works worldwide (for incoming calls anyway) and is not reliant on having a wifi connection.
Sakura can’t do it, IIJ can’t do it (although it does seem that they offer that as an option to corporate clients), Asahi Wimax can’t do it, but if you know a company that can offer it to individual clients, I would love to hear!