You can use your Android phone as a wireless modem to surf internet on your PC, you can do this without rooting your Android phone, i know its interesting.... Here is a really simple and easiest way to turn your android mobile as a wireless modem for your PC. For this you require a free android app, an android phone and a PC.
PdaNet android app does not require root access of your phone firmware. It is just a regular free Android app which works smoothly on android phones. rooting. Supports Mac and PC. Your phone can either connect to 3G data or WiFi, even through VPN and PdaNet will share the connection with your computer.
Steps:
Step 1. Download the PDAnet for your computer from here and install it on your PC.
Step 2. After the installation, now download PDAnet for your Android phone from here and install it on your Android Device.
Step 3. After the installation on your Phone, Now run the app and tap Enable USB Tether.
Step 4. Now connect your Android phone using your USB Cable and it will connect to the Internet Automatically, Or click on the PdaNet tray icon and your computer will go online instantly
nice.....