I've spent the past 20 minutes trying to figure out their model. The only thing I see is "converting voice to data," but that doesn't explain how they can subsidize free plans. No mention (or even accusations) of data mining, either.
Year old, but the most insightful I could find:
http://thenextweb.com/mobile/2013/10/01/freedompop-is-hitting-us-carriers-where-it-hurts-with-its-new-free-mobile-phone-service/
Might consider getting one of these for my mom. She never, ever uses a cell phone, but I'd love her to have one in case of emergency.
Looking forward to your review, Preacher.