https://slate.com/technology/2020/03/coronavirus-clean-phone-wash-hands.html
"While people typically transmit COVID-19 by spewing respiratory droplets with a cough or sneeze, a recent study in the Journal of Hospital Infection found, after swabbing the mobile devices of 250 hospital staff, that coronaviruses can survive on the kinds of smooth glass and plastic found in smartphones for up to nine days. Kenneth Mak, the director of the Singapore Ministry of Health’s medical services, told reporters in February that cleaning phones is an even more important anti-coronavirus measure than wearing face masks. Your phone is, as public health professor Peter Hall put it recently in the Conversation, a “portable petri dish.” Touching an infected surface, or your face, and then a phone is an easy way for the virus to find a home on your screen. The mucus that carries the coronavirus can then dry on your phone, allowing the disease to last longer. A 2019 survey found that people touch their phones 2,617 times per day on average, and experts estimate that the devices generally host 10 times more bacteria than toilet seats, mostly because people don’t commonly clean them as often. Wash your hands! Then wash your phone. “The rule of thumb is that you need to clean it when it’s been exposed to a risk,” says Michael Schmidt, a microbiology and immunology professor at the Medical University of South Carolina. “When you’ve been out in public and you return home, that’s when I would clean the phone to make certain that the phone is safe in your residence, so you don’t have to be washing your hands continuously subsequent to using it.” Apple instructs users to clean iPhones by first unplugging all cables and then rubbing them down with a microfiber cloth and warm soapy water. Google similarly recommends cleaning the backs and sides of Pixels with cleaning wipes or household soap, and to hand-wash the case fabric with mild soap or laundry detergent."
