I don't have to estimate -- I have a college student with a smart phone with an unlimited data plan. Because it's unlimited, he does not bother to go wifi -- ever. So, he burns between 300 and 700m a month. I get that.
I have a smart phone which is paid for by my employer. It has by-the-byte data. I use it the way I described and rarely approach 100m in a month. So, for me, the 250m/mo for $50 per year is a good deal.
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