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T-Mobile explains why its network went down

If you’ve been wondering what could knock out one of the United States’ three big cellular carriers’ ability to deliver calls and text messages — and keep it that way for most of an entire day — T-Mobile now has a partial answer that pertains to its extensive nationwide outage Monday. The short version, if we’re reading this correctly: a fiber-optic circuit failed, and its backup circuit also failed, which caused a chain reaction that strained the network to the point that many calls and texts couldn’t make it through.

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