Insert the 3G modem on your PC and disable the SIM PIN code. This is usually found under Tools>>Options.
Insert the 3G modem on your router.
In web browser (IE or Firefox) access the menu page of the router (default IP address is http://192.168.1.1)
Go to WAN >> Internet Access Setup page
Enter the following details
- APN Name: telstra.bigpond
- Enter your PPP username and password
- Click [OK] button