The 5G question has long been carts and horses. The next-generation wireless network has always been an inevitability, of course, but the rollout has always felt a bit piecemeal. T-Mobile, to its credit, is looking to flip the switch all at once (kind of), launching a “nationwide” deployment of 5G to a coverage area it says will reach 200 million of the U.S.’s 327 million residents.