Track and trace: will the government's new app work?

Tracking and tracing the movements of people with symptoms of Covid-19 is key to the next phase of ending the lockdown. But as the government trials a contact-tracing app on the Isle of Wight, Alex Hern reports on concerns about privacy, effectiveness and trust. Help support our independent journalism at <a href="https://www.theguardian.com/infocus">theguardian.com/infocus</a>