According to new data from Oxford University, the Contact Tracing app may already saved thousands of lives in England and Wales by telling more than 1.7 million people to isolate. Apparently, the app has been downloaded over 21 millions times so far.
https://www.notebookcheck.net/Researchers-claim-that-the-NHS-COVID-19-contact-tracing-app-has-prevented-almost-600-000-infections-in-England-and-Wales.519571.0.html