It's not that simple. If I'm paying for unlimited data, then what should it matter to Sprint if the data is being used by the phone or by a PC connected to it. If I watch a Youtube video, stream some audio, check e-mail, browse the web, etc and go through 100 MB of data in one day, what difference does it mate to Sprint? It doesn't make a difference, they're just trying to charge a premium for the convenience. I remember when I first got cable internet service at home my cable company said routers weren't allowed and you could only connect one PC. If you wanted to connect more than one you'd have to get two modems and pay twice the price. Yet millions of people got routers anyway and eventually the cable and DSL companies relented. I don't see how this is much different.