I'm waiting for a business with a similar business model that just sells SIM cards for pre-paid data. There are lots of great arduino shields or devices out the

I'm waiting for a business with a similar business model that just sells SIM cards for pre-paid data. There are lots of great arduino shields or devices out there (GPS trackers and the like) that I would love to use and toss in a SIM card and just pay for the data used from a pool account rather than a price-per-month for every line AND data that's never used.