On Siri's Data Usage

Gary Morganthaler, reporting for Forbes:

Arieso presents no data to support their claim that Siri causes the increase in iPhone 4S data usage. Most likely, Arieso committed a logical fallacy which, in grammar school, was called “post hoc, ergo propter hoc” — that is, “ after the fact, therefore, because of the fact.”  In other words, Siri is new and associated with the iPhone 4S; therefore, it must be the cause of this increased traffic. It’s an appealing argument, but it doesn’t hold water.