https://www.mercurynews.com/2020/12/07/california-rolls-out-new-app-to-alert-you-to-covid-19-exposure/ > As California’s latest coronavirus surge spreads at a record-setting pace, state officials on Monday unveiled a new cell phone app aimed at curbing the number of Californians who may be unknowingly fueling the transmission of the fatal disease. > Starting Thursday, Californians will be able to opt into the new app — dubbed CA Notify — that will send notifications to their cell phones informing them if they have been in close proximity to someone who has tested positive for the virus.