I would think that for contact tracing, you need more than Uber/Lyft/Verizon-level GPS/WiFi triangulation/cell tower triangulation accuracy inside cities. With

I would think that for contact tracing, you need more than Uber/Lyft/Verizon-level GPS/WiFi triangulation/cell tower triangulation accuracy inside cities. With contact tracing, a proximity of 1 or 20 meters probably makes a large difference. Hence these apps will also have to use Bluetooth Low Energy continuously. https://www.imec-int.com/en/articles/imec-sets-new-benchmark-with-30cm-accurate-and-secure-localization-solution-based-on-bluetooth https://www.imec-int.com/en/articles/imec-sets-new-benchmark...