Is there anyone who has jailbroken the Softbank's Iphone 3G in Japan?

As i wanna Jailbreak my iPhone but want to be 100% if its gonna have the Softbanks Signals and Wifi working.

Anybody???

Same here.. Japanese users are not the kind to break void their warranty... So not enough feed back yet. Personally, I'd love to take videos and change my theme, but softbank's net plan is too good to screw up over a few customized icons.
Since tethering would cost you a month worth of salary in half a day, I wonder if JBing is worth the risks over here...

Ya rightly said but still iPhone 3g is missing so many gr8 functions like locking your Pictures and also there are no games in it.

i Wandered around so many Forums to check if there is anyone who has jailbroken his iPhone 3g From Softbank but didnt find any

Discussed my Situation in other Forums and the people living and America n Europe said that they have successfully jailbroken their iPhone 3g and Japanese iPhone should not be different from the one they are using in America and Europe.

So i am still in a confusion whether to Jailbreak my iPhone or not?
Still waiting for a satisfactory answer