I can’t unpair my watch . And I don’t have access to my old phone
I can’t unpair my watch from old phone
Apple Watch Series 3, watchOS 6
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On a computer, go to iCloud.com and sign in with your Apple ID.
Go to Find Iphone.
Select All Devices, then click your Apple Watch.
Click Erase Apple Watch.
Select Next until the device is erased.
Click the remove button next to your Apple Watch.