apple watch won't pair to new phone

Here is the guidance you need→How to pair your Apple Watch with a new iPhone - Apple Support

Reset the watch and make sure both devices are using the latest update available. What error is it giving you?

My watch won't turn off, it seems frozen with the apple symbol and 1/4 a progress ring

is the watch plugged into a power source?

That usually means it’s updating. Just leave it on its charger until it finishes. That usually takes no more than 30 minutes.