Comment by kayodelycaon
13 hours ago
Emergency services (with the proper software) have been able to get your precise location from your phone for a while now.
This isn’t a new capability and shouldn’t be surprising.
13 hours ago
Emergency services (with the proper software) have been able to get your precise location from your phone for a while now.
This isn’t a new capability and shouldn’t be surprising.
None of this should be happening without the user's knowledge and consent. Swap out your phone carrier for Facebook and it should be plainly obvious why the current state of affairs is undesirable.
I think this feature is required for emergency calls if your specific carrier is not available/in reach - in emergency mode after the phone is restarted, it does connect to any carrier when calling 911, not only yours?
It does indeed. When making emergency calls a phone can switch carrier though generally it will only do so when the main carrier is unavailable or overloaded.
What is it’s a mentally ill person who is about to kill themself?
That’s the majority of uses for the system in the UK. People love to run away and waste police time.
That’s not a good excuse for mass privacy violation.
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You know about it because your regulatory body requires the system exist.
And it’s typically disclosed in one way or another.
Between buying a phone and reading the OS EULA to providing an E911 address to my carrier, I can count at least three disclosures of this feature.
Nothing is secret or magic here.
I spent ~5 years volunteering for a search and rescue team in New Mexico.
We definitely got the cellphone tower triangulation data. I never once saw GNSS data provided by a carrier. We used FindMeSAR https://findmesar.com/, the subject would usually text back the coordinates from the phone.
Just one data point.
The revolution that's occurred since my SAR volunteer days is the wide availability of satellite messenging on consumer phones. I'm guessing that's really changed the situation quite a bit.
One method is a "hidden sms" which your device sends after you called the emergency number on your own merit.
The article seems to describe another system which can be involved externally.
Surely that only happens when the phone user dials 911 ?
The 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-...
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.
> 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.
You're thinking of Phase II E911 in the US.
That's true, but you can always be triangulated down a couple hundred meters by figuring out which towers you're connected to.
Triangulation is far more accurate than that in cities. And in rural area that accuracy is already enough to identify the house you're in.
How would that work?
Phone detects that you call emergency service and enables gps.
Last time I called 911 (well, it's 112 in my country) my android phone asked if I want to provide gps coordinates. I did, but they still asked for address, so probably this is not integrated/used everywhere.
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The phone could literally pop up a consent alert asking whether to respond to a GPS ping request from the carrier. Or just not honor the pings at all unless you dialed 911 within the last hour.
This is a specific service inside the phone that looks for messages from the carrier requesting a GPS position, it could just refuse, or lie. It's not the same as cell tower triangulation.
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Send the GPS location only when dialling a 3-digit number? Phones probably know which numbers are emergency numbers
A phone knows if it’s dialing 911. It can activate features on this criteria
It already exists. Emergency call is spec-defined.
Carrier* Android and iOS both integrate with RapidSOS UNITE. RapidSOS then processes the rich emergency information from the user's device (enhanced location, videos and photos, etc), and is available to the 911 dispatcher in their dispatch software. 99.99% of Americans are covered by RapidSOS integrations in their municipalities.
https://rapidsos.com/public-safety/unite/
When the call comes in they can click a button and query RapidSOS for current 911 calls for that number and pull the information inwards.
https://www.baycominc.com/hubfs/2025%20Website%20Update/Prod...
In the UK, it happens when you call 999 or 112. I don't think 911 is supported, although it probably should be (it'd be a mess to get everyone to agree to add it to their routing tables, but I bet there's a nonzero proportion of people who watch American TV programmes and think the emergency number is 911 - or, for that matter, American tourists).
When you dial 999 it forwards your phone's GPS location if it has a lock to the provider, who then forwards it on to one of the 999 call handling centres in the UK, who then in turn forward that on to the appropriate emergency service control room. All the various services use various different products for telephony and dispatch but they will show the incoming location, and often will prepopulate an incident with the location.
The system that does this is called "EISEC" - Enhanced Information Service for Emergency Calls - and has a lot of cool stuff defined in the spec (which is publically available! You can just go and read it! BT offer a "Supplier's Information Note" with the protocol and details of how the information is encoded) that also handles calls from landlines. These are easy - your telephone provider knows where you live. OMG! The phone company know where I live? Yes, dumbass, they pulled a wire right into your house, of course they know where it is. For VoIP the situation is a little different but you can notify your VoIP provider of the location that the number is being used at, and it'll inject that into the EISEC request.
You can do other cool stuff like if you've got fixed mobile telephone in a vehicle, you can assign the make, model, registration number, colour, and so on in the EISEC database, so given a call from a phone number they know what car they're looking for. No-one uses this.
The very great majority of calls coming in to 999 are from mobiles. It's extremely rare to get one from a landline.
None of the providers use triangulation for determining where a phone is, it's all GPS.