The contact tracing API only works on devices running the public version of iOS.
If you live in Canada and have an iOS or Android device, download the app to participate.
You can download the app if you're not in Canada, but there is no benefit from tracing notifications due to how Canada's app tracks infections.
Canada's app, called COVID Alert, is one of the first high-profile uses of the API and is available for all iPhone users in Canada.
Canada's coronavirus contact tracing app using the Apple-Google API has been released, with it showcasing the simplicity of the tool.