There are three common strands of advice for minimizing the spread of Coronavirus, issued by bodies like the NHS and the WHO. If you have to sneeze, do it into a tissue or your sleeve. Avoid contact with unwell people, and wash your hands with soap, often.
Your phone complicates that last one. Sanitize your hands all you like, bacteria and viruses sitting on your phone may be transferred right back to those hands as soon as you check WhatsApp or Instagram.