I've finally got a hold of a iPhone 3GS from SoftBank, and seeing how my internet provider (AOL) are taking their sweet time on doing the maintenance for getting a internet connection into my apartment I've been looking at different ways of getting a internet connection on my computer via the iPhone.
Got it Jailbroken as well, using SpiritJB for iPhone 3GS running on 3.1.3 / any baseband / any bootrom.
So far I'm using a 3rd party software (PDAnet) which works well, but costs money when the trial period is over..
I've read that you can configure the iPhone to work as a bluetooth/WiFi access point (tethering?) but I can't seem to find the settings needed for Softbank. And what kind of worries me is; do softbank allow tethering? If I can play it safe using PDAnet I'll suck it up, and buy it when the trial is over, but if there is a way of configuring the iPhone I'd really give that a try.