iPhone Average Bill is Lowest of Smartphones [graph]

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The data is from Pageonce -financial account aggregator- and DesignTaxi made two graphs. One that shows iPhone users have highest monthly credit card expenses (averaging $6,872 -if you're interested, the graph is at the source) and another that shows the one I just posted above.

Not gonna lie, I was surprised to see WinMo users have the highest monthly bills. I'm taking this with a grain of salt until I figure out how the determining factors but I'm still confused as to why AT&T (well, iPhone) is the lowest. Those a-holes were robbing me.

How much is your monthly bill?