After graphing the #MB vs $, we found that people using 0-5 MB per month should go with the basic plan for data, those using 5-125 MB per month should go with the $9.99/month plan. Finally anyone using 125 or more should be signing up for the unlimited $29.99 per month plan.
What was surprising to many was that the medium plan ($9.99/month + 25 MB) was the best deal even with overages for up to 100 MB of overages per month. Overages are usually seen as a bad thing, however if the cost of your plan and your overages are still less than the next bigger plan, then you should not feel cheated.
This weekend you are asked to try to compare the three types of plans from AT&T (popular because of the iPhone). The setup is very similar to Verizon and the plans are available both on the worksheets section as well as on the links section of this site.
The only problem I see with this (and the Verizon plan, though we ignored it the first time through) is the large number of 'free' minutes when calling within the plan. For example if a VerizonWireless customer is calling another VerizonWireless customer, those minutes do not count against either user.
For the purposed of the comparison we'll ignore this because for now I'm not sure how we could quantify those 'free' minutes.
Good luck to everyone on this weekends comparo.