Apple 1 1 cannot switch the secondary card by SMS. What should I do?

IPhone can hold two cards, a primary card and a secondary card. So how to switch the secondary card to send SMS on the iPhone is actually very simple. Here's how to switch the secondary card to send SMS on the iPhone.

1. First, open the Apple phone and click the information at the bottom left.

2. Enter the information interface and click the pen icon on the upper right, as shown in the figure below.

3. Enter the new information interface, click the+sign behind the mobile phone person, and enter the address book to select friends who want to send text messages.

4. After selection, you can see that the main number appears in the new information interface at this time, and click the main number.

5. Finally, after selecting the account to be used now, click the sub-sign to switch, as shown in the figure below.