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Hello @sandee1018, nice to see you again in our Community. Yes, if your phone is the Galaxy S3 then it is compatible. You can find this information on our List of Compatible Devices.
Although I would like to add, it will also depend of the OS of your mobile device and if it will support the newest version of the Fitbit app. However if the OS doesn't allow the new update of the app you have the option to install the supported version for the OS of your phone.
Let me know if you have additional questions.
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