The NHS COVID-19 app is no longer in use and the Isle of Wight trial has now ended. This is archived information from 18 June 2020. If you still have the app, please uninstall it.

When you install the NHS COVID-19 app, it will start logging the distance between your phone and other phones nearby that also have the app installed. It measures this distance using a form of Bluetooth that is less energy hungry than normal Bluetooth (“Bluetooth Low Energy”). This log of anonymous proximity information will be stored securely on your phone.

If you become unwell with symptoms of coronavirus, you can allow the NHS COVID-19 app to inform the NHS and trigger a notification that the NHS will then send, again anonymously, to all other NHS COVID-19 app users with whom you came into significant contact over the previous few days.

The decision of precisely which other NHS COVID-19 app users are notified will be determined by a sophisticated ‘contact risk model’. NHS doctors and scientists will continuously update this ‘contact risk model’ to make it as accurate as possible. The model will be based on scientific principles and it will be approved by the Chief Medical Officer.

The technology is based on research evidence developed by epidemiologists, mathematical modellers and ethicists at Oxford University’s Nuffield Departments of Medicine and Population Health.