What we need, before we start tracking individuals by use of phones that they may, or may not, have with them is a consistent method of testing and reporting infection and mortality rates across the globe.
For example, Italy's mortality rate is so high because everyone who dies that is infected with CoV-19 is recorded as having died of the disease rather than the true cause of death.
As it stands at the moment, all this comparison of how well or how badly countries are doing in the fight against the virus is comparing apples with oranges.