iPhone freezes when connecting to Apple Watch

Greetings Joshua,

Thanks for visiting the Apple Support Communities! It seems you're unable to pair your Apple Watch with your iPhone.

After a few unsuccessful pairing attempts, test after restarting both devices and your router.

On your iPhone, tap Settings > General > iPhone Storage, and check for an Apple Watch software update, and delete it if one is found. Then try to pair again.

Additionally, test after deleting and reinstalling the Watch app, and test after updating watchOS:

• Delete built-in Apple apps on your iOS 12, iOS 13, or iPadOS device or Apple Watch - Apple Support
• Update your Apple Watch - Apple Support

"Update directly on your Apple Watch

If your Apple Watch has watchOS 6 or later, you can install subsequent updates without your iPhone:

1. Make sure that your watch is connected to Wi-Fi.
2. On your watch, open the Settings app.
3. Tap General > Software Update.
4. Tap Install if a software update is available, then follow the onscreen instructions."

If the issue persists, reset the network settings on your iPhone, or test while connected to a different network: If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network - Apple Support

"Reset your Network Settings. Tap Settings > General > Reset > Reset Network Settings. This also resets Wi-Fi networks and passwords, cellular settings, and VPN and APN settings that you’ve used before."

If the issue continues, reach out to Apple Support for further assistance: Get Support

Kind regards.