How to turn on/off COVID-19 contact tracing on iPhone
  On iOS 13.5 and later, head to Settings on your iPhone  Swipe down and tap  Privacy  Now choose  Health   Tap  COVID-19 Exposure Logging  at the top  For now, you’ll need an authorized app before Exposure Notifications can be turned on. But then you can tap the toggle to turn notifications on or off  You can also delete the exposure logs manually at any time at the bottom of the settings.      Please note that on iOS 13.5 "The COVID-19Exposure logging  is disable by default.