During the 14 days, if the telecoms detect that a phone moves outside of the quarantine radius, an SMS is sent not just to the phone but also to the phone of the local medical offices who would check your whereabouts. Instead of paying you a stipend of US dollars, I think 33 US dollars per day, for your work in quarantine, if you indeed break out of quarantine, then you are fined up to 1000 time debt. I think less than 1% of people do break the quarantine because it’s fined very heavily. And also, the equitable tracking of the phone’s whereabouts is done entirely at a telecom level so it’s not like the telecom outsources it to some third party data processors, which may sell it to advertisers or something. This is entirely within the same data processing pipeline that already enable earthquake and flood warnings.