https://fi.google.com/about/

Basically they're using other peoples' networks and infrastructure to give you cheap cell service. Only a few Nexus phones work with it currently and the network is absent from a large part of the midwest, but it could still be a decent option for anyone looking for an inexpensive cell plan. $20 for standard calls and texting and $10 per GB of data, with no fees for going over and unused data is rolled out via credit to the next month.