On Mon, 21 Sep 2020 07:22:01 +1000, wrote:

Odd that it works fine in Singapore and South Korea.

Indeed, it works as well as any talisman would.

Personally, I think a rosary would work better - but I'm Catholic so if
you're not, then what works best for you may depend on your religion.
--
"Evidence for the use of automated or partly automated contact-tracing
tools to contain severe acute respiratory syndrome coronavirus 2
is scarce."
o Automated and partly automated contact tracing: a systematic review to inform the control of COVID-19
https://www.thelancet.com/journals/landig/article/PIIS2589-7500(20)30184-9/fulltext