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How to use the secondary card to send text messages for iphone dual card dual standby?

How does iPhone use the secondary card to send messages? How does the dual card choose the secondary card to send short messages?

Many models including iPhone 1 1 series already support dual cards. Some friends may encounter some problems when using it, such as not knowing how to switch cards to send iMessage messages or short messages. Please refer to the following information, hoping to help everyone.

The method of sending short messages by selecting secondary card from dual card;

When starting a new conversation, after selecting the recipient, there will be a button below to prompt you to choose the primary number or the secondary number. You can switch the number of messages sent by this button:

Open the information application, click the "New Information" button in the upper right corner of the screen, enter the contact name, click the current phone number, and then click the number you want to use.

After selecting the primary number or secondary number, the SMS of this number will be sent by the card you choose by default. If you want to change the card, send a message to this number, delete the previous message in the SMS list, restart the session, and re-select the primary and secondary numbers.

If you can't send information through another card:

If you can't switch numbers to make calls or send messages to people who aren't in the Contacts application, please confirm whether you choose to allow this number for iMessage messages. In iOS 13 settings, you can select one number or two numbers at the same time.