Begin on the old iPhone that you’re replacing.
On that phone, firstupgrade it to the latest version of the iOS.
If so, perform the upgrade.

When you see this screen, the iPhone is rebooting.iPhone image: KP Photograph/Shutterstock
This might seem unnecessary, but it’s not.
see to it that your old iPhone is syncing your Apple Watch Health and Activity data to iCloud.
This is key to transferring the data to your new iPhone.

Do this by going toSettings> [your name] >iCloudand verify theHealthslider is set to on/green.
If you use a Mac or PC, double-check you check the option to encrypt the backup.
You don’t want to lose all of that data!
Set up your new iPhoneand choose to restore the backup you made in the previous step.
When the iPhone asks if you want to use your Apple Watch, tapContinue.
Put the new iPhone and your Apple Watch near each other.
On the iPhone, initiate the Apple Watch app.
Pair the Watch with your new iPhone.
Restore the Watch from a backup when you’re given the option.
After all, you don’t want to lose months or even years of health and workout data!
If your Health and Activity data is missing, you have a few options.
Next, ensure the Health slider is set to on/green inSettings> [your name] >iCloud.
Then,connect it to Wi-Fi.
This will start the process of syncing data from iCloud to your phone.
Depending on the amount of data, this could take minutes or days.
If You Have a Backup of Your Old iPhone
Try restoring it onto the new iPhone.
Remember, the backup has to be encrypted or it won’t include Health and Activity data.
Install thePeloton appto your Apple Watch > selectMore>Apple Watch>Set Up>Connect to Health App.
launch the Health app and selectTurn On All> start using Peloton app.