My Apple Watch is not pairing with my new iPhone

To fix this, you must erase your Apple Watch to remove it from your old phone's lock. If you still have your old iPhone nearby, unpair it through the Watch app. Otherwise, factory reset the watch directly in its own settings, then open the Apple Watch app on your new iPhone to pair. 

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

Welcome and thank you for reaching out. 🤗

First, make sure that both devices are up-to-date:

• iPhone Software Update.
• Watch Software Update.

Then make sure both devices are in close proximity with the following settings:

• AirPlane turned off
• WiFi turned on
• Bluetooth turned on

Learn how to ⇢ Connect/Pair your Watch for detailed instructions.

If you need more help, contact Apple Support directly.

Good luck! 👋🏼😉

Smiliñ 😎 Brian | Community Volunteer