AT&T is extending its 5G network to consumers and into sub-6 GHz spectrum, after an initial period when it has been targeting enterprises with its millimeter wave network. This will shift its competitive landscape considerably. It will move from battling with Verizon for ‘early mover’ laurels, but with build-outs that have been limited in geography and use cases; to going head-to-head with T-Mobile USA, which has promised to use its dominant position in the 600 MHz band to achieve full coverage at low cost, and so be able to offer the most attractive consumer ‘Uncarrier’ propositions for 5G and video. AT&T will use 850 MHz spectrum for its first low-band roll-out, and with a two-mile radius, base stations in these…