I'm planning on Buying an iPhone and unlocking it to use on an At&t business plan that I'm currently on....the reason for this is because my phone bill is dirt cheap. My question is which data plan does At&t offer that is the equivalent of the iPhone data plan? At&t is not going to let me add the iPhone data plan on a non-iPhone account so I have to get the next best thing. Any help would be greatly appreciated. Thanks.