Apple watch
How can I pair my Apple Watch with my new phone if the phone it was paired to is no longer working?
Apple Watch
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How can I pair my Apple Watch with my new phone if the phone it was paired to is no longer working?
Apple Watch
To unpair and erase watch and remove Activation Lock.
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.
Then go here;
See especially “If you don’t have your old iPhone” here.
How to pair your Apple Watch with a new iPhone - Apple Support
Apple watch