Pairing iPhone with Apple Watch

if your post is a question as to how you go about doing so then try reading

How to pair your Apple Watch with a new iPhone - Apple Support

Can you give s more details?

The general pairing process is described here:

Set up your Apple Watch - Apple Support

If you want to pair your watch to a new iPhone, have a look at this article:

How to pair your Apple Watch with a new iPhone - Apple Support

And in case pairing is not possible, have a look at the general troubleshooting mentioned here:

If you can't pair an Apple Watch with your iPhone - Apple Support