How does iphone switch between primary and secondary cards to send messages?

With the improvement of people's living standards, more and more people begin to use dual-card mobile phones. When using a dual-card mobile phone, how to switch between the primary and secondary cards to send messages becomes a problem. This article will introduce in detail how iphone switches between primary and secondary cards to send information.

Step 1: Set the default sending card.

First, we need to set the default sending card in the settings of iphone. The specific steps are as follows:

Open the settings application.

Click "Telephone"

Find the default sender card option.

Select the card slot to be set as the default sending card.

Step 2: Switch the sending card.

When we need to switch sending cards, we can do it through the following steps:

Open the Messages application.

Click the "New Information" button in the upper right corner.

After entering the mobile phone number of the recipient, click the "+"button in the lower left corner of the input box.

In the pop-up menu, select Sender.

In the pop-up interface, select the card slot to use.

After entering the complete information, click the "Send" button.

Through the above two steps, we can easily realize the function of switching between the primary and secondary cards of iphone to send messages. However, it should be noted that when switching sending cards, you must ensure that a valid SIM card has been inserted in the selected card slot, otherwise you cannot send information.