Apple Watch
My Apple Watch series not connecting my I phone 13
iPhone 13, iOS 16
Question marked as
You didn't say which series. If series 3 or older make sure the iPhone is on iOS16.2 and erase the watch in Settings, General, Reset, Erase all content and settings.
Then I recommend reviewing the steps in the articles below
How to pair an Apple Watch with your iPhone
How to pair your Apple Watch with a new iPhone - Apple Support or
Can’t pair an Apple Watch with your iPhone
If you can't pair an Apple Watch with your iPhone - Apple Support or
Apple Watch not paired with your iPhone
If your Apple Watch isn't connected or paired with your iPhone - Apple Support