How to send text messages on dual-card Apple phones?

According to the personalized demand of localization, Apple launched the Bank of China version of mobile phone with physical dual card for the China market. How to send text messages with Apple's dual-card mobile phone when sending text messages with a mobile phone?

How to send text messages on Apple dual-card mobile phone? 1. Open the SMS editing dialog box and click the sender number above.

2. Click the calling number and switch the mobile phone number to send SMS.

If it is a new message, just enter the recipient information and click the calling card button to switch.

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