More Ideas for the Raspi CarPuter

So I bought the┬ásleeve for my iPhone. Basically it gives you WiMax coverage with 500Mb data a month for free, and you can do other things to up your data amount. You buy the thing for $99 and always have 500mb for free. So why not buy another, and have it be for the carputer, now I would always have internet on it to stream pandora, slacker, etc for free! It’s just a thought, but could come in handy!