Re: Easy to fix..
"Don't install the app, then you know with 100% confidence that its a scammer.""
You do know that the track and trace system doesn't rely on the app, has already started operation and that the app is not yet available anyway, don't you? You not having the app doesn't stop someone else from reporting you as one of their contacts (assuming you actually are one). If you know for sure you've never met the conditions to be a contact, then yes, any call is likely to be a scammer.
Biting the hand that feeds IT
