[bergman]

On earlier iPhones, there was a way to change a profile (?) file to make the non JB phone think that one was authorized by ATT to use data tethering without paying. is there such a solution available for the iPhone 4? At this point, the only compelling reason to jailbreak (in my opinion) is to share my data connection with iPad or laptop.

[Slyfi]

there is no simple file change... its JB or nothing and i don't think there is a way to share directly with iPad unless you tether to laptop then make your laptop broadcast a local wifi network

[Relic]

You can JB and get MyWi and have your phone broadcast a wifi network for the iPad to use. Just watch the iphone's battery!