I know how to tether it for Mac, but what do I use to tether it with PC? I want to plug in my iPhone with a data plan on it already and be able to go online with my computer/laptop.

Please refer me to a good free program. Thanks.

http://letmegooglethatforyou.com/?q=...hering+windows

PDAnet is a great tethering program. It basically turns your iPhone to a wireless router. You can get version 1.40 off cydia. It's a trial that expires after 15 days and costs $29. Or you can downgrade it to version 1.33, which is a free version. There's a thread in the Tools section to tell you how to downgrade

well mac has imodem which works excellent. does windows have something like that that's free? i just want a computer software for pc that lets you plug it in and good to go to go online