How to use iphone 3g without getting charged data

HI! I have an iphone 3g and was wondering if there was a way i could use it without getting charged data, I'm barely paying for the pone i have now without any extra charges, so is there a way i could use the iphone without getting charged? If i jailbreak it or unlock it can att still pick up that i'm using an iphone?

Added (1). Someone said i couldn't get free data, they mis-understood my question. I don't want free data, I want NO data.

There's no way to hack/root/jailbreak the phone in order to get free data.

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