When 5G is mentioned, most people are talking about millimeter wave spectrum, which offers blazing fast data transfer speeds, but it is sensitive to interference from buildings, trees, and other obstacles and it is best suited to use in dense, urban locations. In total, more than one million square miles are blanketed in coverage, we're told. T-Mobile hasn't actually forgotten about the other 130 million people in the USA, as a sentence halfway through the carrier's press release notes that "T-Mobile's network covers more than 60 percent of the population".
T-Mobile is also advertising that new customers can get the phone "free" via bill credits with a qualifying trade-in, and existing customers can snag up to $300 off. T-Mobile did not answer that question. There are 19,495 incorporated places in the US. Alaska is excluded entirely.
"5G is here on a nationwide scale".