This is similar to Tmobile free 200mb data plan. But it works on any unlocked GSM devices including phones. I believe it uses T-mobile network in U.S. And you also get free data globally. Since GSM (not Sprint), the plan is no longer tied to the device. You can swap the SIM to another device.
The downside is HSPA+.
Here is the article: http://www.engadget.com/2016/01/2...lobal-sim/
updated: 2 options
1. $49.99 Mifi: may include SIM
2. $10.00 SIm card: temporarily sold out