Syncing with bluetooth on Android is awful! (My version is an 11 so it's not too old) I just bought a new phone and am trying to set up my Fitbit with it for health reasons and it WILL NOT work. I have reset both devices many times and they won't connect. My tracker is a versa 3 so that's not practically dust tech speaking either. The app makes it a miserable experience to have to set up a new device or switch to a new one. Please, if you have time work on that... A lot. I do love the app though