App Store or Google Play and is the Official NHS contact tracing app for England and Wales. Below, Professor Christophe Fraser, professor of pathogen dynamics at the Nuffield Dept of Medicine, University of Oxford, has answered some of the biggest questions Mirror readers have about the app, covering privacy, quarantine and more.
Having the app is the fastest way of knowing when you’re at risk from Coronavirus - and the quicker you know, the quicker you can alert the people you care about, and your community.
It runs on proven software developed by Apple and Google, designed so that nobody will know who or where you are. And you can delete your data, or the app, at any time.