I suspect this is a factor of what I like to call the Apple "decay" factor. Year after year, when Apple pushes a new iPhone, your old iPhone becomes slower, making the gap between new and old artificially bigger.
Case in point: iOS6 on iPhone 3G/ 3GS. iOS7 on iPhone 4/ 4S. The trend continues.
True but this graph points out that iPhone 6+ users use twice as much data than iPhone 6 users. Both of those phones came out at the same time, so there must be some other explanation.
Good point. Perhaps the data spike is more of the target demographic? I refuse to believe the most logical conclusion we can make from the data is that iPhone 6+ users view it as a tablet. I mean, if you used an iPhone 4 or 5, the 6 seems like a huge step up. Those who went straight to the 6+ likely had used an Android phone of similar size.
But I digress. Interesting information nonetheless. Wouldn't be surprised if AT&T/ others slap on a surcharge for owning a bigger phone now, simply because they'll likely use more data.
Case in point: iOS6 on iPhone 3G/ 3GS. iOS7 on iPhone 4/ 4S. The trend continues.