Just finished doing this to get unlimited data on my device. I then called ATT because on their website it showed I have the unlimited data and text for $40.00 but on account usage it still showed 2gb data pro. When I called, the woman I spoke to let me know that the change would not take effect until tomorrow, which is why I still saw the 2gb of data. She also told me that ATT was aware of the trick to get unlimited data, and that the loophole would soon be closed, but those with the unlimited data already would not be effected. Now I'm not 100% sure if they truly are working on closing the loophole, but to those who are holding off on doing it I suggest doing the data trick ASAP.