If you attempt to log in with an incorrect password 5 times within 5 minutes, the system will automatically lock you out for 5 minutes. Bluetooh must be enabled to make a tracking app work. A separate app installed later enables tracking. You can enable it under Settings > Privacy > Tracking > Allow Apps to Request to Track. The API allows apps, from public health authorities and governments installed separately, to track your location and determine your exposure to the COVID-19 virus. The latest iOS 13.5 iPhone update includes a new exposure notification API.