In your phone settings, you may see a section for Exposure Notifications or Exposure Logs . This is the Apple and Google technology that the NHS COVID-19 app uses.
In Exposure Checks , you can see a list of timestamps that are recorded every time your phone receives a list of anonymous ‘keys’. The NHS COVID-19 app does not hold a unique identifier for individuals. Instead a unique key is temporarily assigned to a user which changes regularly over a period of time. This is to ensure privacy is maintained for NHS COVID-19 app users.
The figures for number of keys , or provided key count , indicate keys from app users who have newly tested positive for coronavirus (COVID-19). The number of matches or matched key count indicates how many of those app user keys you have been in close contact with.