Despite all the hype about millimeter wave deployments and auctions in the USA, only Verizon has placed these high frequency bands at the center of its first-stage 5G plans. AT&T is rolling out some base stations, mainly for fixed wireless, in 39 GHz, but its big push into mobile services will be focused primarily on sub-6 GHz bands. Sprint is heavily reliant on its existing, and plentiful, 2.5 GHz airwaves for its first 5G deployments. And T-Mobile is even further down the spectrum with its plan to launch 5G on a wide coverage basis in 600 MHz. TMO’s aggressive strategy may, however, have to change if it fails to acquire Sprint, whose midband riches will complement the wide area 600…