Japan - Travelsim, UM, other?

[monkeyboy]

Originally Posted by razfaz

UM +44 not working at all, shows "Unregistered SIM", (just like at home on UMTS).

Is there no hope that UM+ (44) will ever cover Japan? Kind of a pisser... its not like Japan is some 3rd world country... most believe that Tokyo will become the next Wall St and the yen will become the new benchmark currency...

Is it possible to trade my UM+ for UM (423) (which I gather *does* support Japan)?

Well I hope at least Celtrek is decent in Japan (including Osaka and Kyoto...)