How do I switch numbers when sending text messages on Iphone 1 1pro?

Iphone 1 1pro SMS number switching method/steps;

1, open the phone and click the desktop information;

2. Enter information and click Add Information in the upper right corner;

3. Next, select the recipient, and the main number will be displayed. Click on it;

4. Next, click the secondary number to switch;

5. After that, the handover is successful;

6. Next, edit the message content and click the Send button;

7. The final transmission is successful;