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How the NSA monitors America’s phone traffic

scoop from The Guardian confirmed what many people suspected—the National Security Agency (NSA) is spying on the phone activity of millions of Americans. Using a secret court order, which was not disclosed to the public, the NSA obtained bulk phone records for Verizon’s customers on a daily basis. Each day, the NSA would receive a massive flood of data from Verizon.

How do they do it, and what can they do with the information?