RootMetrics is one of only a handful of independent firms that have spent years tracking major carriers’ cellular networks on a city-by-city basis, and its new report may provide the final look at the performance of U.S. 4G networks before the . The conclusion: America’s are “all over the map” in terms of network performance, but at least four-fifths of them are already strong 4G performers, and they’re only going to get better in the very near future.

Between Verizon, AT&T, T-Mobile, and Sprint, the list of initial 5G cities generally spans large and recognizable metropolitan areas, but 4G performance isn’t necessarily

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