Which leads me to my last point: There's too many variables here. Focusing on phone model and total data used doesn't speak enough to app preferences, platform differences, and ecosystem maturity. Frankly, as a Nexus 5 lover waiting for the iPhone 6, I really like how iPad raises the bar for iPhone app quality. I don't expect things to take off for Android until Google convinces people that the Nexus 7 isn't just a bigger phablet, perhaps with new APIs. The one thing Google got right vs iOS that no one will argue is their API compatibility layers. It keeps older platforms feeling modern -- when was the last time you saw a pre-5.x app on the App Store? Android goes back to single-digit API numbers easily. (8 or so, at this point.)