I lost the phone that was connected to the watch how can I pair it
How can I pair my old Apple Watch to my new phone? My old phone that was paired to Apple Watch was stolen.
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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;
How to pair your Apple Watch with a new iPhone – Apple Support