Where is the authorization code on the Apple phone?

The authorization code is also the serial number. Here is how to query the serial number:

Tools/Materials

iPhone model iPhone8

iPhone system version ios11.4.1

1. Find the settings option on the phone. Open "Settings" and scroll down to see that there is a "General" that we choose to open.

2. Open "General" and find the first item on the panel, "About This Mac".

3. After opening, we can see the "serial number" by scrolling down. It’s that string of English plus numbers