Tether Apple iPhone 3G to Laptop. A pair of programs, 3proxy and MobileTerminal can help you to tether a jailbroken iPhone 3G to laptop. This will use your iPhone 3G as a wireless modem. Tethering your iPhone is against the iPhone data plan terms. AT&T could slap you with huge fees if you overuse it.
Here’s the basic rundown:
+ You’ll need a jailbroken iPhone 3G (you can use this iPhone 2.0 Jailbreak Guide with Pwnage Tool 2.0.1)
+ Install 3Proxy and MobileTerminal (available from the “Cydia” application that was installed during the iPhone 3G jailbreak)
+ Create an ad-hoc WiFi network on your laptop
+ Join the network with your iPhone
+ Find out the iPhone’s IP address
+ Open MobileTerminal and run the proxy program
+ Open Safari on your iPhone and open a web page
+ Configure your browser to use the proxy
+ Done.
The folks behind cre.ations.net have a nice tutorial + screenshots to do this. More details are available from here.
Tether iPhone to Leopard using EDGE. Methods for tethering the iPhone (using its EDGE connection from a desktop system or other device) have thus far been complicated and fraught with issues. Thanks to the hard work of Jonathan “NerveGas” Zdziarski, however, the process has become easier and more robust. Yes, Jonathan “NerveGas” Zdziarski has just released a new method to tether your iPhone to your Leopard computer (laptop). For the uninitiated, “tethering” your iPhone to your laptop allows you to share (connect) your iPhone’s data connection - your laptop is essentially using your iPhone as a wireless modem. 
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