So here's a fun fact: when you look at a carrier's coverage map, you're actually seeing its best guess as to where coverage is strong/weak/dead/etc. It's basically a theoretical map – it's where they should have coverage (but no promises are being made).

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T-Mobile, once again priding itself on being "uncarrier," is changing the way it does its coverage maps, and it actually makes a lot of sense. Instead of just using guesswork to let customers see their coverage area, it's crowdsourcing using real-time customer data.

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