How to connect a Apple Watch
How to connect a Apple Watch to another iPhone under the same email address
iPhone XR, iOS 14
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You have to unpair the watch from the old phone first;
From a web browser,sign in to iCloud.com with your Apple ID.
Go to Find iPhone.
Click All Devices at the top of the screen.
Click your Apple Watch.
Click Erase [device]. Select Next until the device is erased.
Click Remove from Account.
Then;