I just spoke to my friend who was in quarantine and I think it might be exaggerated a bit.
It's not using an app and the technical documents I can find about it do state cell tower triangulation, with a mix of all the providers to make it more accurate.
I would have thought it wouldn't know if a phone is stationary or not then, as it's not going to be accurate enough for that - perhaps that part of the story isn't 100% right.
However they do definitely turn up at your house if you turn it off or don't respond to one of the messages in time - that has happened to quite a few people!
If you're using the phone to enforce a quarantine restriction, then network triangulation will suffice; you don't need a smartphone for that. They will know if the phone has moved more than a couple of hundred metres, and they can ensure you and the phone are still together with a random 'challenge-response'; either by text or voice call.
What the NHS are trialling on the IOW is more sophisticated, and (this is a simplified version) is a smartphone app that logs whenever two phones come closer than a specified distance apart. If the user of one of the phones goes on to develop symptoms, they report via the app, and an anonymised message is then sent to the users of all the other phones which have been logged by the app as having been closer than the specified distance for a specified time. There's more information about how this all works on the NHS website. Interestingly it doesn't use either network triangulation or GPS, rather it uses bluetooth to detect another phone in close proximity.
A phone running either Android 8 or iOS 11 (or better) is needed; this will rule out quite a few older smartphones. Also the app will need to run a background process, and you'll need to keep bluetooth turned on.
The app is open source; anyone can download the code, including potential hackers. With bluetooth permanently enabled, I'd have security concerns about this.
put your phone number in here see how accurate it is https://buddy-locator.com/?l=T8ZY
You almost caught me out with that fake website.
The first time I tried it, it told me I was in Edinburgh.
When I tried again a couple of minutes later, it said I was a few miles north of Watford.
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