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Has it stopped syncing or has it never synced?
Have you checked that your phone is supported by fitbit at www.fitbit.com/devices ?
Restarting fitbits can sometimes sort out issues. Here's how:
https://help.fitbit.com/articles/en_US/Help_article/1186/
(give this a few tries as it doesn't always work)
Here's fitbit's troubleshooting guide for syncing problems:
Best Answer