Apple's iOS update is here — and it includes coronavirus contact tracing

Apple and Google on Wednesday released long-awaited smartphone technology to automatically notify people if they might have been exposed to the coronavirus. The companies said 22 countries and several U.S. states are already planning to build voluntary phone apps using their software. It relies on Bluetooth wireless technology to detect when someone who downloaded the app has spent time near another app user who later tests positive for the virus.
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