Contact tracing and the venue check-in function are 2 separate ways that the app protects you from coronavirus (COVID-19).
We encourage you to always:
keep your contact tracing switched on except in a small number of situations
check into venues when there is an official NHS QR code poster on display
When you have contact tracing switched on, your app will use Bluetooth to know when it has come into close contact with other nearby app users. ‘Close contact’ is generally 2 metres for 15 minutes or more. If any of those nearby app users later test positive for coronavirus, you will receive an alert with advice to self-isolate and book a test. The alerts are based on a ‘risk-scoring algorithm’ developed by scientific experts.
When you check into venues using the app and official NHS QR code posters, this data is held on your phone.
If it’s identified that people who were there on the same day have since tested positive for coronavirus, you may get an alert advising you to get a test The venue check-in feature works independently of the contact tracing feature. If you get a venue alert it will not tell you to self-isolate.