We first caught wind of Sprint's plans to launch a couple dual-mode CDMA / WiMAX devices under the "Sprint 4G" brand a couple days ago, but we're thinking about it a little more, and we're struck by the carrier's decision to run its 4G services as an MVNO on Clearwire's new Clear network. Sprint's balance sheet is basically upside-down at the moment, so we sort of understand why it's not eager to directly invest in a build-out of 4G infrastructure, but at the end of the day, leasing access to a network for general voice and
