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Technology is not exactly known to be stagnant. What is not practical now could be in just a few years.

For high value targets, all bets are off anyway. Some nation states have virtually unlimited resources they can call on.

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Yeah, exactly. This is just a back door to phone tower triangulation, something every nation state has access to and uses regularly and publicly as part of normal criminal investigations.

But phone tower triangulation is only readily available to nation states on their own soil. For tracking foreigners tracking signal strength might be a useful alternative.

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