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Welcome to the Community @Moraldrose! The Samsung Galaxy 7 still over a testing process and it might be already compatible, so just to confirm that, I suggest you to make sure you have the latest version of the Fitbit app on your phone and then set it up your Fitbit as a new device. In the meantime you can also take a look into the compatible devices list to see if you can use any other phone to set up/sync your tracker.
I will appreciate your patience into this matter. 
Have a great day!
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