![East Sussex, UK, 17 July 2021: A mobile phone shows an NHS Covid app order to self-isolate due to possible coronavirus exposure, part of a 'Pingdemic' affecting hundreds of thousands of people. East Sussex, UK, 17 July 2021: A mobile phone shows an NHS Covid app order to self-isolate due to possible coronavirus exposure, part of a 'Pingdemic' affecting hundreds of thousands of people.](https://c8.alamy.com/comp/2G864H9/east-sussex-uk-17-july-2021-a-mobile-phone-shows-an-nhs-covid-app-order-to-self-isolate-due-to-possible-coronavirus-exposure-part-of-a-pingdemic-affecting-hundreds-of-thousands-of-people-a-ping-means-being-instructed-to-self-isolate-after-coming-into-contact-with-or-attending-a-venue-with-someone-who-has-subesquently-tested-positive-for-covid-business-and-society-are-being-thrown-into-disarray-due-to-large-numbers-of-people-being-asked-to-self-isolate-causing-some-business-to-temporarily-close-and-some-people-to-delete-the-app-anna-watsonalamy-live-news-2G864H9.jpg)
East Sussex, UK, 17 July 2021: A mobile phone shows an NHS Covid app order to self-isolate due to possible coronavirus exposure, part of a 'Pingdemic' affecting hundreds of thousands of people.
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More than 600,000 people told to self-isolate by NHS Covid-19 app - here are the Derbyshire 'Pingdemic' figures | Derbyshire Times
![Coronavirus: New NHS contact-tracing app vulnerable to 'malicious false alerts', warn experts | The Independent | The Independent Coronavirus: New NHS contact-tracing app vulnerable to 'malicious false alerts', warn experts | The Independent | The Independent](https://static.independent.co.uk/s3fs-public/thumbnails/image/2020/05/05/08/nhs-contact-tracing-app.jpg?width=1200)