Sam Diaz, CNET:

What's especially telling is how a consulting firm that was hired by the lawyers of the plaintiff conducted its own test of the data billing. Instead of using data and trying to measure it independently for comparison against the bill, the consultant did the exact opposite. The firm bought a new iPhone and immediately turned off all push notifications and location services, made sure that no apps or e-mail accounts were active and then left the iPhone idle for 10 days. AT&T billed the account for 2,292 kilobytes of data over 35 transactions.