My father recently acquired my iphone 4. He is on the 200MB plan. His philosophy is that if you have 200MB, and you pay to use 200MB, why not use all of it? Our billing cycle ends the 9th of every month. On the 2nd he was about 50% into his 200MB. So he decided to stream his radio station since he wanted to use what he was paying for. When he got the 90% warning text which happened the 8th he turned off the data on his iphone and stopped streaming. The 9th, at 11:45AM he received a text from AT&T claiming he had used over 100% of his 200MB and will be billed $15 for another 200MB allowance. Remember, his cellular data is turned off at this point. And on top of that, our billing cycle ends about 12 hours after this text was received. On the website it shows he used 202 out of 400 MB. Now, because AT&T's data usage is back logged, it is impossible to use all the data one pay's for. It is also outrageous that we are required to pay $15 for a 12 hour window where supposedly 2MB of data was used. Sigh.