https://www.theguardian.com/technology/2020/aug/27/google-and-apple-to-roll-out-phase-two-of-contact-tracing-system

Operating system update will allow opt-in to coronavirus exposure notifications without need of an app

Apple and Google are preparing to roll out “phase two” of their Covid-19 contact-tracing system, allowing users to receive notifications about their exposure to infectious people without needing to install a specific app.