I believe the industry term for using your phone as a data modem is called tethering and it is not offered to the owners of iPhones. However, few smart people have figured out how to do it. Remember, all the risk is on you and you may get fined or kicked off from AT&T.

Here’s the basic rundown:
- Jailbreak your iPhone 3G
- Install 3Proxy and Terminal
- Create an ad-hoc Wi-fi network using your laptop
- Join the network with your iPhone
- Find the iPhone’s IP address
- Open Terminal and run the proxy program
- Open Safari on your iPhone and open a web page
- Configure your browser to use the proxy

More detailed explanation with screen shots can be found here.

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