The website FunkySpaceMonkey has an article on how to get free tethering without jailbreaking.
Here is the article link
Here's how it begins:
Here is the article link
Here's how it begins:
So you got that new shiny iPhone 4, and you got rid of your old device that was so easy to jailbreak and add tethering to? No MyWi? Don’t want to pay the extra “convenience” fee and lose your unlimited data package? We have an answer. Now its not a one click gets it done. But it will get it done. You’ll need a couple of things, but not really hard to find things. You either need to have or have access to a paid Developer account so that you can sign a built app and install it on a device. If you’re a developer, you already have xCode, and you know how to deploy an app onto a device. And the actual tethering part we will be showing you on a Mac, but I’m sure its not much different on a PC, we just don’t have one to do it on.
Here we go. Head on over to http://wiki.github.com/tcurdt/iProxy/ and download the source code."