need to pair my apple watch with new phone

Please read the following two support pages for help pairing your Apple Watch!

1. If you can't pair an Apple Watch with your iPhone - Apple Support
2. If your Apple Watch isn't connected or paired with your iPhone - Apple Support

To unpair and erase watch and remove Activation Lock

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;

Setup your Watch to a new iPhone