If I may suggest an alternative
If you have a mobile phone with Telstra and it is pre-paid...
Recharge at least $20. Get a '
$20 Browse Plus Pack' which will give you 700mb of data. Should be enough.
- If you have a Windows Mobile smart phone, plug it in and turn on Internet Connection Sharing. Zing.
- If you have just a regular mobile, you might be able to setup dialup networking provided you can tell the mobile to appear as a modem (the options will be either something like data or usb drive).
That's for Testra, but really you should be able to find instructions on any carrier for any mobile phone that has 3G capability and you are using pre-paid. I managed to get this
sort of working on OS/2

should be a breeze on Windows.
Cheers,
Brendon