So, what's a flagging cellular operator to do once it has succumbed to the grim realization that no one wants to sign up for your service and you've already collected the dough from selling off nearly all of your towers? Go wholesale, of course! Unbeknownst to most, all of the Kindle downloads on Amazon's white-hot e-reader go through Sprint's network, and given just how successful that little venture has been, the carrier is hoping to expand its revenues from wholesaling bandwidth (which currently