Data never expires (there is a nominal annual fee to keep a plan active) and by default auto-refills whenever it gets low (up to a user-configurable limit every month). Data is purchased in blocks of 5GB and works on most major carriers in the USA and Canada.
This plan is prepay pay-as-you go and purely data, ideal for JMP customers who already have a phone number through us. No use-it-or-lose-it, no lock-in, just prepay 5 GB at a time for the data you actually use. Prepaid data never expires no matter how long it takes you to use it, and by default automatically buys another 5GB when your data gets low (you can change this in your plan settings).
Is this plan intended to be cheap? It's likely cheaper to use a regular wireless data or hotspot provider if you use more than 3GB/month (roughly $22/month) or even 1.5GB/month (roughly $11/month) in some cases.