Download and install the Fitbit app from the App Store
Open the Fitbit app and sign in or create a Fitbit account
Turn on Bluetooth on your iPhone
Make sure your Fitbit device is charged
Open the Fitbit app and tap your profile picture or account icon
Tap Set Up a Device
Select your Fitbit model from the list
Follow the on-screen instructions
Keep your Fitbit close to your iPhone during setup
Enter any pairing code shown on your Fitbit if prompted
Allow Bluetooth, notifications, and location permissions if requested
Wait for the app to finish syncing and pairing
Confirm your Fitbit appears in the app as connected