What is the difference between T-Mobile's $70 and $60 prepaid plans?

My girlfriend currently uses the $70 prepaid service for her iPhone 5, but wants to spend less money every month. She's thinking about switching to the $60 or $50 plans but we don't really know the differences between them because they all give relatively little information on the plan selection screen, and they all say unlimited everything. I'd just like some help figuring out if they slow your data drastically or something like that. A detailed explanation of each plan.

$10.00

The difference is in how much data you get to use before they throttle it. This page has a detailed explanation, under "Monthly Plans": http://www.prepaidphonenews.com/2012/01/prepaid-carrier-profile-t-mobile.html

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