A new Covid-19 contact-tracing app will be launched across England and Wales on 24 September, the government has announced.
The app will let people scan barcode-like QR codes to register visits to hospitality venues and will implement Apple and Google's method of detecting other smartphones.
Businesses are being asked to display QR code posters to support the app.
Health Secretary Matt Hancock described the launch as "a defining moment".
The first version of the NHS contact-tracing app, intended for the whole of the UK, was trialled on the Isle of Wight in May but later abandoned.
"We need to use every tool at our disposal to control the spread of the virus including cutting-edge technology," said Mr Hancock.
"The launch of the app later this month across England and Wales is a defining moment and will aid our ability to contain the virus at a critical time."