Use your iPhone OS 3.x as Modem for Internetconnection

[Update]: This doesn’t work anymore from OS 3.1 onwards. With the iPhone OS 3.0 Apple implemented so called “Tethering”. This is a very simple method to use your mobile phone as modem at your pc/mac. So you do not need to have a second SimCard ( called MultiSim ) with an USB-Stick. The problem is [...]