How To Use Your iPhone as a Wireless Laptop Modem
Excerpt from pcworld:
“…Jailbreak your iPhone
Download and install QuickPwn, an easy-to-use jailbreaking application for Windows and Mac (the latest version works with iPhone OS 2.2.1). Run the software and follow the onscreen instruction very carefully!
Install iPhoneModem by Addition
QuickPwn installs an app on your phone called Cydia, which is essentially the App Store for apps that were rejected from the official App Store (or, for whatever reason, the developer chose not to release through Apple). Run Cydia, search for iPhoneModem by Addition and install it. Keep in mind you can only delete Cydia installed apps via Cydia’s Manage-Sources function. Now download and install the helper app on your laptop and you’re almost ready to go.
Set up the network
Run the helper app and hit Connect. The helper app sets up an ad hoc wireless network that can be accessed via iPhone. The default network it creates is called “iPhoneModem” and does not have a password (you can change this in the Preferences of the helper app). Now open up your iPhone’s Settings and tap WiFi. Make sure WiFi is turned on and select the network “iPhoneModem” (or whatever you called it). Type the password if you assigned one. Open up the Modem iPhone app and everything else will configure automatically. After a few moments the helper app and the iPhone app will confirm that a connection has been established and you can browse away with all the comforts of your laptop!
Shortcomings
While 3G seems plenty fast on a phone, it feels a little slow on a laptop. Also, most major web browsers work but not all are supported. In addition, a lot of other internet applications aren’t supported, but for all intents and purposes, you should be able to browse just fine….”


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