California’s new contact-tracing app: What you need to know(latimes.com)
latimes.com
California’s new contact-tracing app: What you need to know
https://www.latimes.com/business/technology/story/2020-12-07/california-just-launched-a-contact-tracing-app-what-do-you-need-to-know
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Summary: California, working with Apple and Google released an app called "CA Notify" to contact trace COVID-19 spread. The app uses "Bluetooth to determine when two devices have been near one another for more than 15 minutes."
iPhone users can activate the app by enabling "Exposure Notifications" under settings.