How are they gathering this data?
Are they placing detection equipment at/near the target locations to monitor for cell phone signatures in the vicinity, or are they gathering from mobile apps who resell location data to aggregation firms?
Are they placing detection equipment at/near the target locations to monitor for cell phone signatures in the vicinity, or are they gathering from mobile apps who resell location data to aggregation firms?
https://techcrunch.com/2019/01/09/us-cell-carriers-still-sel...
I'm guessing location data comes from the Apple/Google location APIs that can map peoples aprox locations based on their proximity to Wi-Fi points (I think they register Wi-Fi points and then the first GPS signal the phone gets after; like when someone walks outside, and use a set of those to get approximate triangulation for indoor Wi-Fi APs).
I reckon it'll be coming from catriers
I assume there is a geofencing API call that returns a bunch of GUIDs and another that takes a GUID and gives a location with last time seen?