January 16, 2021: Updated with latest states including Hawaii and Wisconsin.
Apple and Google announced plans to build COVID-19 tracing into iPhone and Android operating systems on April 10, 2020. The move marked a major partnership between the top two mobile operating system competitors in an effort to limit the spread of COVID-19. Platform updates to enable the COVID-19 contact tracing feature on iOS and Android were publicly released 40 days later on May 20, 2020.
So how do you participate in COVID-19 contact tracing efforts with your smartphone? In this story, 9to5Mac is tracking which U.S. states and territories are using Exposure Notifications API in iOS and Android apps.