How to switch dual-card SMS on iphone 1 1?

Operating system: iOS 14.4. 1.

1, first click information to enter, as shown in the figure below:

2. Enter the information interface and click New, as shown in the figure below:

3. Enter the new interface and click the recipient, as shown in the figure below:

4. Enter the recipient number or add an address book, as shown in the figure below:

5. After adding the recipient, the default mobile phone card name will appear. Click on the mobile phone card, as shown in the figure below:

6. The option of two cards appears, and switch to the card to be used, as shown in the figure below:

7. If the handover is successful, enter a short message and click Send, as shown in the figure below: