Thanks to parent Softbank’s financial support and creative leasing programs, Sprint has better liquidity than it has for years, and is expected finally to leap ahead with its next generation LTE network in 2017. Sprint has talked for years about the advantages of its plentiful holdings of 2.5 GHz spectrum once the priority for mobile broadband networks shifts from coverage to capacity. It stayed out of the ongoing incentive auction of 600 MHz broadcast spectrum on the basis that it had sufficient airwaves to last for the foreseeable future, and these were optimal for adding capacity, unlike sub-1 GHz bands. The 600 MHz band is the “spectrum of the past”, Sprint CFO Tarek Robbiati said during a recent investors’ conference.…