Manage your Apple ID settings on Apple Watch - Apple Support
https://support.apple.com/guide/watch/manage-your-apple-id-apda9ebaa6d3/watchos
WEBChange your Apple ID password: Tap Change Password, then follow the onscreen instructions. Edit or add a trusted phone number: Tap Two-Factor Authentication, tap your current trusted phone number, verify when prompted, then tap Remove Phone Number—if you have only one trusted number, you must enter a new one before you can delete the current ...
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