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See wiki-leak Vault 7 RE: CIA/NSA tools embedded into every aspect of modern tech.

Fren... They can map your house using the wifi transmitter in your phone by analyzing the signal strength and running it through an algorithm that can extrapolate a "mapping" based on the SigStr fluctuations as your GPS is active (even when disabled) as you move about your house in daily life.

There's far more to it than that... but that's just one example.