The entire investigation cost about $80,000 and was conducted by using different carriers and different devices, one of which was the iPhone 4 for AT&T. Even when it was not in use and had every single application that might use data turned off, the iPhone 4 used data 35 times according to AT&T's data usage statistics. The results were quite surprising, to say the least.
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source: MSNBC via 9to5 Mac