How to switch between Apple's primary and secondary numbers to send text messages?

The method of switching between primary and secondary cards by SMS of Apple mobile phone;

1. Go to Apple's mobile phone desktop and find the green dialing icon below;

2. Click Address Book in the bottom menu bar;

3. Find the contact you want to call, and then click the contact;

4. After entering the contact details page, click the main number under the contact name;

5. You can see the primary and secondary number options in your mobile phone, click Switch, and then send a text message.

It should be noted that if you are a contact who has saved SMS records, when you stop at the SMS interface, you must delete the current SMS records to switch between the main card and the secondary card. If you send it directly, the card that accepts SMS by default will send information. If you don't want to delete SMS, take the SIM card that doesn't send SMS out of your phone and put it back after sending SMS.