There is a phone app in Canada that was released last week that anonymously tracks your contact with other phones that have the app installed. If someone with the app tests positive, they can input the positive outcome in the app and, if you've been in contact with that person for more than 15 minutes at one time, it will alert your phone that you've had a possible exposure. The app relies on people installing it, using it, and putting positive tests into it. I'm not sure how successful it will be, as I don't know many people that have installed it. Although it's early days. I haven't installed it yet, but I probably will.
More info at this link if you're curious about how it works. https://www.canada.ca/en/public-heal...vid-alert.html
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