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Not if it's so massively inefficient that the number of false positives mean that you waste time chasing air.



Massively inefficient meaning that 100x phones are not paired with people? That seems unlikely.


If people were at home when the quake struck it doesn't seem unlikely to me that only 1 in 100 would be in the immediate vicinity of their phone. (Maybe 1 in 100 is a strech, but 1 in 20?)

Who carries their phone in their pocket at home?




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