Originally Posted by mobileista
It's not so much a big mystery that AT&T has a larger voice footprint in the US over T-Mobile. They're just bigger.
However, AT&T doesn't say they have the best coverage in America.
They say they have the "best coverage," and then in fine print: based on global coverage. Those of us familiar with carrier advertising call this "spin." The point is to emphasize the arguable point as if it's a fact then rationalize it with by some form of technicality. Nobody does this better than AT&T.
In some areas, T-Mobile may have an advantage over AT&T if the cell sites happen to favor that particular spot. Your mileage may vary.
“The Internet wasn’t meant to be metered in bits and bytes, so it’s insane that wireless companies are still making you buy it this way. The rate plan is dead — it’s a fossil from a time when wireless was metered by every call or text.” John Legere 1/5/2017