Before revision:  Results suggest that the app can contribute substantially to the reduction of infections in the population  , although complete suppression of the virus is unlikely to be achieved.
After revision:  Results suggest that the app can contribute substantially to the reduction of infections in the population when accompanied by a sufficient testing capacity or when the testing policy prioritises symptomatic cases. As user rate increases, prevalence of infection decreases. With that, when symptomatic cases are not prioritised for testing , although complete suppression of the virus is unlikely to be achieved.