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Fitbit Product Experts Alumni are retired members of the Fitbit Product Expert Program. Learn more
What you basically wanna do is make sure it’s up to sync with your old device, then disconnect it from the app. Delete the app on old devices and go to Bluetooth settings on your old devices and make sure it’s forgotten your Fitbit.
Then on your iPhone 8 if you’ve already installed your Fitbit app delete and reinstall it, and continue the process of connecting with your new device. The blue tooth sync should work.
It can't sync to 2 devices so it has to be removed from your old phone first
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Fitbit Product Experts Alumni are retired members of the Fitbit Product Expert Program. Learn more
What you basically wanna do is make sure it’s up to sync with your old device, then disconnect it from the app. Delete the app on old devices and go to Bluetooth settings on your old devices and make sure it’s forgotten your Fitbit.
Then on your iPhone 8 if you’ve already installed your Fitbit app delete and reinstall it, and continue the process of connecting with your new device. The blue tooth sync should work.
It can't sync to 2 devices so it has to be removed from your old phone first
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Community Moderator Alumni are previous members of the Moderation Team, which ensures conversations are friendly, factual, and on-topic. Moderators are here to answer questions, escalate bugs, and make sure your voice is heard by the larger Fitbit team. Learn more
Hello @dusty22, thanks for joining the Fitbit Community, it's a pleasure for me to welcome you! It's nice to see you too @ACG, I appreciate your help with this situation. 
@dusty22, if you have tried the steps @ACG suggested and your tracker is still not syncing correctly I would like to suggest you the following:
- Restart your Charge 2
- Restart your phone.
- Restart the Bluetooth on your phone through the phone Settings (not through Control Center)
- Make sure you have a strong WiFi signal
- Make sure there are no other Bluetooth devices around as their signal might interfere with the syncing process.
- Open the Fitbit app and check if your tracker starts syncing again.
If your tracker is still not syncing correctly, my best recommendation would be setting up your tracker as a new device to reset the connection between your phone and your tracker. Don't worry, none of the information previously stored will be deleted.
To set up your tracker as a new device:
- Go to the Bluetooth settings on your phone and check if your tracker is on the list of paired devices. If it is, tap on it and select Forget this Device.
- Open the Fitbit app and tap on the Account symbol at the top right corner of the screen, then tap on "Set up a New Device"
- Choose your tracker and follow the onscreen instructions to continue
- When the app asks you to replace your current tracker, please replace it and continue with the process.
I hope this can be helpful, give it a try and if there's anything else I can do for you, please don't hesitate to reply.
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Community Moderator Alumni are previous members of the Moderation Team, which ensures conversations are friendly, factual, and on-topic. Moderators are here to answer questions, escalate bugs, and make sure your voice is heard by the larger Fitbit team. Learn more
Hello @Beargirl555, I hope you're doing well, it's great to have you on board the Fitbit Community!.
I'm really glad your issue has now been resolved and I appreciate you have taken the time to let us know. In case you have some spare time, I would like to invite you to visit our Discussions board where you will find great tips and encouragement from other members and if there's anything else I can do for you, please keep me posted!
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