Install Wear OS by Google on iPhone 13 Pro

 1. App Store > Search > Type: Wear OS by Google > search

2. Click Get button next to 'Wear OS by Google' >

3. App Store:
   > Install
 
4. Open

5. Wear OS by Google
   > Start setup

6. Terms of Service
   > Agree

7. Enable Bluetooth sharing
   > Enable

8. "Wear OS" Would Like to Use Bluetooth
   > Allow

URL: https://support.google.com/wearos/answer/6056630