said by BiggA:And there's no connection here. You give a 50MB/mo user a bigger phone, they still will use 50MB/mo.
You do not need to be a "power user" to appreciate watching streaming videos more on a 5" screen than a 4" screen. Personally, I would not watch video or do much on anything smaller than 7" and my Nexus7 is pretty much the largest screen I can fit in my pockets.
There is also the question of why your 50MB/month user is using only 50MB/month... 50MB in many cases isn't even enough for one Youtube video or one application update... 50MB is little more than a few dozen page views. Someone using less than 50MB/month WiFi+3G/4G is hardly using their smartphone/tablet at all.
Carriers charging $10-20/GB certainly does not help with promoting mobility.