How does Apple distinguish the primary number and secondary number of SMS?

Many people have bought iPhone 1 1, which can be used as the main and secondary cards. But do you know how to switch the primary and secondary numbers when sending text messages on the dual-card dual-standby iPhone 1 1? Let's take a look at how to switch primary and secondary numbers when iPhone 1 1 sends text messages.

How to switch between primary and secondary cards when sending SMS on Apple 1 1 mobile phone?

The method comprises the following steps:

1, open the information program of iPhone 1 1, and click the letter icon to create new information;

2. Enter the mobile phone number of the recipient, or click the "+"sign behind the recipient to select the recipient from the address book;

3. If the recipient number is not in the address book, clicking Edit SMS will pop up the current default SIM card; If the recipient number is in the address book, the current default SIM card will pop up directly after selecting the recipient.

4. Click the current default SIM card, and the minor number and major number will pop up at the bottom of the screen for selection;

5. If you select the secondary number at this time, you will switch to the secondary number to send short messages.

It should be noted that if you are a contact with a short message record, as shown below, you must delete the current short message record to switch between the main card and the secondary card. If you don't want to delete messages, take the SIM card that doesn't send messages out of your mobile phone and put it back after sending messages.