iPhone 3G / OS 3.0で脱獄なし・iTunesも使わずテザリングを有効にする方法 {Engadget Japanese}

Jun 18th 2009 11:36AM softbank does not provide tethering plan yet. anyway this crack method works in japan so far. but no one is sure about penalty and other legal issue regarding this hack.

as far as i used, tethering traffic is fast enough. 2.3 mbps for DOWN with USB.