Apple Google launch smartphone project to alert you if you’ve contacted someone with coronavirus
When someone voluntarily submits a positive COVID-19 diagnosis to an app from a "health authority," their Bluetooth beacon IDs from the previous 14 days are uploaded to a central cloud. (People who test positive are not identified to other users, Google or Apple, the companies say.) The phones of others who have opted-in to the same app periodically check the database, and they will receive a notification if their phone had Bluetooth contact with the device of anyone who reporting testing positive.
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