Starting today, August 20, the mobile app HOIA is available for download to your phone via www.hoia.me, helping to curb the spread of the coronavirus with the help of app users. The application notifies the user if he has been in close contact with an infected person. The phones of the users of the application exchange anonymous codes, and the state, the manufacturer of the application, or the manufacturer of the phone will not know who was in close contact with whom.