How to choose a card for iphone SMS?

The operation steps of selecting an iphone SMS card are as follows:

1. Open "Info" in your mobile phone, enter the information, and then click the small icon edited in the upper right corner, as shown in the figure.

2. In the To column, add the object to send the short message.

3. After adding the payee, the payee will prompt you which card you are using now, and click OK.

4. At this time, a box will pop up, and then you can switch the primary card/secondary number to send short messages.