said by NOVA_Guy 
:Correct me if I'm wrong, but couldn't someone jailbreak their iPhone and use an app like PdaNet for tethering?
Certainly there can't be any clause in the contract about not jailbreaking a phone. And if I recall correctly, AT&T is advertising their $30/mo iPhone data plan as "unlimited".
Just an idea, not as though I'd really consider trying it right now.
That's the thing: you'd have to jailbreak your phone, which is something that most users (including myself) don't wish to do. On top of that, the current solution for tethering on a jailbroken iPhone is anything but elegant. It requires a ton of configuration, and only works for applications that support SOCKS proxies.
