Attached is a chart I made for comparing how much each network (and postpaid/prepaid) costs for different types of usage, I was rather surprised at some of the results.
Download the PDF here
If you have suggestions for more scenarios, or better quantities for existing scenarios, I am more than happy to consider them.
Any errors that are noticed, let me know and I will fix them as quickly as possible. If you would like to see the working behind the charts, I have no problem uploading them on request.