alt Hacker NewsThe cell network routinely does TDoA triangulation in order to help choose which tower should serve the client mobile device. Accuracy is about 20m, and may be better at 5G frequencies. 911 gets the location from the mobile network provider, but the network provider could provide it to anyone, and they do.
Tons of "free" and crapware apps are also recording location, and sending it to data brokers.
https://www.wired.com/story/jeffrey-epstein-island-visitors-...
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hedora • today at 12:03 AM
> Tons of "free" and crapware apps are also recording location, and sending it to data brokers
The last time I checked, that included Google Play Services, and some of their iOS apps.
Using LTE Timing Advance feature, especially on 5G, accuracy can be much higher.
https://5g-tools.com/5g-nr-timing-advance-ta-distance-calcul... shows an example of the parameters necessary. I don't think you can get your smartphone to dump those stats for you, but the granularity of the individual distance measurement is in the tens of centimeters.
Of course this strongly depends on cell infrastructure being placed precisely, continuously updating correction factors, and a bunch of antennae being around the target to get measurements for, but in most cities that isn't much of a challenge if the operator is working together with whoever wants to spy on citizens.