I've been working in the industry selling multiple carriers for 4.5 years. I've looked at thousands and thousands of rate plans and data usage and at least 80%, if not more, benefit from the plans. The 700 minute customer was using a combined total of .15 of ONE gb, and they were paying for 2gb on each line.
Since the AT&T unlimited data plan came back for Uverse/DirecTV customers, I personally have only put one account onto that plan, and have come across one customer who was already on it while doing an upgrade check. And T-Mobile, I have never put someone on the full unlimited high speed plan.
Like I said, there are definitely some people who do not benefit from these types of plans, but the majority do. The average smartphone user uses about 2-3gb of data per month. Those numbers are rising though, since we do so much more with our phones.
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