How to switch between the primary and secondary cards of iphone?

According to the needs of users in China, Apple can support dual sim physical cards from the beginning of iphone xr. How to switch between the iphone primary card and the secondary card? Let's take a look ~

How to switch the main and auxiliary cards of iphone? 1. Click cellular network in the phone settings interface.

2. Select a calling card, and then click Enter.

3. Click on the phone number label and check the major or minor number.

This paper takes iphone 13pro as an example and applies it to ios 15 system.