mobile phone itself so nobody can access the contact data by any means and it is stored anonymously or technically correct Stud anomaly so you can't access any personal data in this app we can exclude that so there's one point where we need to exchange information through a server which is when we notify people so if somebody it wants to issue a warning or a positive result of her of a cuvette test then in this case he has to give his telephone number in order to receive transaction number to have something like or to have