If you're thinking this whole Sprint-SoftBank-Clearwire-DISH fiasco is getting a bit confusing, you're not alone: Sprint's fed up with the whole ordeal, and is now suing DISH and Clear for trying to run off together in a lurid affair of megahertz and majority ownership.
Why, exactly? Well, SoftBank, basically. One requirement of the Japanese firm's deal to buy out Sprint is that the Now Network take a controlling interest in Clearwire, whose juicy 2500MHz spectrum lease is the apple of SoftBank's eye. With Clear and Sprint's combined holdings, SoftBank would become the single largest holder of cellular spectrum in the US.