How to share my Apple iPhone 3GS Internet connection with a computer

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Tethering lets you share the Internet connection from your Apple iPhone 3GS with a computer. Please note that you'll be using data from your mobile network and charges may apply.
In this example, we've used a Windows® 7 computer.
1. Connect the Apple iPhone 3GS to the computer using the USB cable.
2. Touch Settings.
3. Touch General.
4. Touch Cellular.
5. Scroll to and touch Set Up Personal Hotspot.
6. Touch Personal Hotspot.
7. If you see this screen, touch USB Only.
8. The Apple iPhone 3GS is now tethered.
9. On the computer, wait for the device drivers to install then click Home network.
10. Wait while the computer automatically applies the settings and connects to the network.
11. Setup is complete. Click Close.
Note: in step 9, we've selected Home network because we know and trust both the Apple iPhone 3GS and the computer.