We all know how much we love to use our data but with Verizon having dumped their unlimited data plans a few years ago. Now the only way to get truly unlimited 4G LTE data is by doing an Assumption of Liability from another existing Verizon Wireless customer. I have bought and sold many of these plans in the past 18 months. And yes they are legitimate and Verizon continues to honor them and will for the foreseeable future.
If you have an Android phone you can use FoxFi or formerly known as PdaNet to tether that unlimited data to your Mac, laptop or tablet.