AT&T is "systematically" overbilling iPhone and iPad users for data, a new federal class action lawsuit argues. "AT&T's bills systematically overstate the amount of data used on each data transaction involving an iPhone or iPad account," a document submitted on behalf of plaintiff Patrick Hendricks reads. The carrier's scheme is akin to a rigged gas pump that "charges for a full gallon when it pumps only nine-tenths of a gallon into your car's tank," the complaint continues.