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Was that random phones, or phones you knew were actively in use?

I'd imagine a cellular network has some "exception handling" for devices that are not switched on or in range of any of it's base stations. And I hypothesise that whatever mechanism this is using might not crank up whatever "scan the whole network" behaviour that might occur if a not-currently-geolocated phone gets an incoming call/message? 1/10 seems too high to account for that though...

These were people's personal phones that they had with them, but no guarantee that they were actively being used.

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