How do I know that my app is working? 04 June 2020 14:57 Updated If the main screen on your app says “Your app is active’, it means your app has been set up successfully. Related articles How long should I keep the app running? Do I need to keep my phone's Bluetooth turned on all the time? How do I set up TraceTogether? What happens if I was in close proximity of a COVID-19 case? Would keeping TraceTogether running all the time drain my battery quickly? Who can use TraceTogether? Which mobile phones are supported?