A warning about FreedomPop: They'll charge you for the next package of bandwidth when you hit 400MB (supposedly so "You'll never run out of data", more likely so "We'll never run out of cash!") You can't set it to turn off when 500MB is hit.
They also used to charge an "inactivity fee" if you used less than a certain minimum amount of data in a month, even if you were supposedly on the free plan. That wouldn't be so bad, except that the only mention of it is buried in the middle of a 5,000 word document that isn't even directly linked at any point in the signup process: https://www.freedompop.com/service_plan_terms.htm
It looks like they abandoned the inactivity fee in June 2013, but even so, it left me with a very negative impression of the company.
