To use you phone as a modem with internet sharing, you will need to have
Activesync 4.5 installed on your Windows XP computer or Windows Mobile Device Center for a Windows Vista computer and follow these steops:
1. Make sure your USB cable is connected to your computer.
2. Go to start menu.
3. Go to Programs
4. Go to Tools
5. Choose Internet Sharing
6. Make sure the box says USB cable and hit connect and you will get a status message saying that you are connected to the internet on your computer.