More than 1.3 million new people have registered to use the NHS App since the addition of Covid-19 vaccine status was announced on May 7.
The app, which now has more than 4.8 million registered users, is one of the first internationally compliant systems in the world to demonstrate vaccine status.
The Covid-19 vaccine status service allows users to show their proof of vaccine, if required for international travel, and has been designed in line with World Health Organisation (WHO) interim guidance.
More than 22.6 million people in the UK have had two doses of a coronavirus vaccine.
Anyone in England who has had two doses of any approved vaccine and does not use the app or are unable to access digital services, can call 119 and request a letter.
The government announcement about the app’s new users came as Jenny Harries, chief executive of the UK Health Security Agency, said the prospects for ending all coronavirus lockdown restrictions in England on June 21 are “looking good” as long as people are careful.
Harries told the BBC’s Andrew Marr Show that people still needed to take precautions for the time being, particularly as new variants of coronavirus continue to circulate.
The NHS app was launched in January 2019, and already allowed people to book GP appointments and order repeat prescriptions. It is not the same as the Covid contact tracing app. For the last week, those who have it on their smartphone have also been able to display their vaccination status.