[joelkek]

Yeah GPS casts too wide a net (imagine being in New York- everyone in a 80-story office building would be within margin of error of a single GPS point).

Bluetooth seems like a better solution, and the Singapore one does it in a privacy-preserving way while storing all data on the phone. Only when a user is infected, then are they asked to upload data.

https://tracetogether.gov.sg

[ryanisnan]

How does this work if one has a bluetooth receiver off?

[true_religion]

It doesn’t. It also doesn’t cover people without phones, like most children. Or people with feature phones that don’t have Bluetooth.

Yet it’s still better than nothing.