But the idea was that based on these so called measurements, you might get a call asking you to stay indoors for 2 weeks and potentially not be paid by your employer.
This is probably nonsense, although, if you are referring to the UK government. it just might be true. Down here in God's Own, we indeed have actually had a phone app in service for a couple of months or so. There is no excuse for dithering with it, you use it for what it can do, rather than try making it do what it can't. When you get past all the silly stories, it is just an additional contact tracer. If your number comes up, you get advised that you may have been exposed, you should get tested, and where and how to that. That's all.
On the technical side, it includes what I understand to be a vital criterion that the above posts forget - duration of contact, which I think is 15 minutes. This gives it time to sort out varying signal strengths to see what is of interest and what's not. Nobody claims it is the greatest app but, while BoJo and his mates in Westminster twiddle their thumbs, it has been in service since April, about six million have it, and it has given some results. Indeed, one clear reason why the results have not been that great is that it is just an aid, and other initiatives are also in use. As I understand it, the main purpose of the phone app is tracing who have it but don't know it.
And that is the nub of the "flattening the curve" process.
The concept is to reduce the deathrate somewhat
Indeed, and if you don't do anything, you land in deep shit, and the economy gets wrecked anyway. Even with our scandals, blame shifting, elitist skullduggery, and mind-numbing incompetence, we have managed to keep the deaths down to about 100 in a population of 25 million. This would suggest that, with a population of 66 million, the UK might reasonably expect 300 dead, and the other 41 700 take quite a bit of explaining.
Of course Britain, being an island, could have imposed total isolation immediately that the virus was reported in China. But that would have meant that no person, not even a UK national, could enter Britain.
Rubbish. When you see what's going on in Wuhan, you let your own citizens in, quarantine them in all those now empty hotels, and shut the gate. How hard can that be?