My watch has become unpaired with my iPhone but is still registered to my iPhone so I can not re register
New iPhone model 13 ProMax but can’t get my old Watch 3 to connect
Apple Watch Series 3, watchOS 7
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To remove the watch from your old phone;
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;