The iPhone 4S uses twice the amount of mobile data than the iPhone 4, and three times as much as the 3G.

A new study suggests that Siri, the well-advertised voice assistant for the iPhone 4S, actually doubles the mobile data usage for those who take advantage of it.

The study by Atlanta-based mobile network monitoring firm Arieso said that iPhone 4S owners use twice as much data as iPhone 4 owners and three times as much data as iPhone 3GS users. In an interview with Bloomberg, Arieso CTO Michael Flanagan specifically calls out Siri for helping these owners use more data. Venture Beat

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