Honestly, I have had nothing but problems with the Fitbit app on 3 different smartphones. Unless I open the app and sync my device, it will never sync. Even if I leave the app open and running on my phone, I still have to bring the app up to resync my watch. I love the Fitbit hardware but this app works very inconsistently. Now I have a new phone and I can't even get it to register my versa 2 on the app.