Sprint CTO John Saw has thrown cold water, again, over the hype about millimeter wave spectrum for 5G. With Verizon and AT&T vying to be first to deploy 5G (initially for fixed wireless) in high frequency spectrum, Sprint is focusing on its biggest asset – its plentiful holdings of midband spectrum in 2.5 GHz. The US operator was crowing recently when the 3GPP adopted its 2.5 GHz band – which it already uses for high capacity LTE – as an official spectrum option for 5G New Radio (NR). This gives Sprint the chance to refarm 2.5 GHz spectrum in future for 5G, and to make use of some of the airwaves which are currently unused. At the Citi conference in…