And so within this equitably applied 21 days, the telecoms already know where your phones are, anyway, because they need to provide roaming services. And so, just by measuring cellphone signals strength, they know, roughly, where your phones are. But it’s not like GPS where they know the room you’re in, this is more like the block you’re in, within a 50 meter radius. People are already used to getting, for example, advance earthquake warnings or flood evacuation warnings and so on that are also location-based and SMS-based, so people understand the general policy and cyber security implications.

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