How to sync fitbit to iphone 4s?

I just got the new fitbit. I'm trying to sync it through Bluetooth but for some reason the Bluetooth is not recognizing the fitbit. Is there an effective way to making it sync.

You tried this?

https://help.fitbit.com/customer/portal/topics/210564-the-fitbit-app-for-ios/articles

BTW, might want to check up on the FitBit recall notice, if you haven't already returned your FitBit.

Frustrating but keep trying. This happened with a headset of mine. Just took longer than I thought it would.
Best luck.

https://help.fitbit.com/customer/portal/articles/1028541-setting-up-your-tracker-with-the-fitbit-app-for-ios

https://www.fitbit.com/iphone

https://help.fitbit.com/customer/portal/articles/1027612-my-tracker-is-not-syncing-with-the-fitbit-app-for-ios

https://help.fitbit.com/customer/portal/articles/1027598-how-do-fitbit-trackers-sync-with-ios-devices