I have heard of the 3g and 3gs unlocked iPhones getting charged a data fee because AT&T eventually found out that you were using an iPhone without buying their data plan. Is this the same for the iPhone 4? I want an iPhone 4 but I don't have nor want the data plan. I use wifi a lot anyways. And if it is possible, what ios's are unlockable and which ones should I not buy?
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