How do I know that my App is working? 09 September 2020 03:36 Updated If the main screen on your App says “Your app is active’, it means your App has been set up successfully. Related articles I'm home alone — why are there Bluetooth exchanges with other TraceTogether users? I see "COVID-19 Exposure Notifications" in my phone's operating system. Do I need to turn it on for my TraceTogether App to work in the background? How long should I keep the App running? Do I need to keep my phone's Bluetooth turned on all the time? Who can use the TraceTogether App? Which mobile phones are supported? Would keeping TraceTogether running all the time drain my battery quickly?