Bytemobile carried out identical tasks on apps using an iPhone (presumably 3GS) and 3G iPad, and found that many generated substantially higher amounts of traffic on the iPad. This is explained by the iPad display's greater area, which shows more and larger graphics. USA Today's app used 6.3 times as much data on an iPad, while Maps ate up 2.6 time as much. This will have some impact on whether people choose a 250 MB or unlimited 3G plan (or any 3G plan at all). Bytemobile's interest? It works with cell operators to optimize content to reduce mobile data use and congestion.
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