Sprint MVNO FreedomPop today launched a new service aimed at tablets dubbed "LTE FreedomPop Tablets." Initially the MVNO is selling the iPad mini ($319) and the Samsung Galaxy Tab 3 ($199), and both will come with free LTE data as well as the ability to make free phone calls with a unique phone number that can also be used to text. If you already have your own tablet, you can port it to FreedomPop and get the same 500 MB free LTE data, 200 voice minutes and 500 texts absolutely free.
FreedomPop is an MVNO prepaid provider that I've rated as one of the best MVNO's in the market offering unlimited data with 1 GB LTE before throttling to 3G and unlimited talk and text for $20.