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How does iphone switch the secondary card to send messages?

How to send text messages with a secondary card for iphone?

Model: iPhone 1 1 (system version: IOS 13)

Take iPhone 1 1 and IOS 13 systems as examples:

1. Click the Info icon to create a new message and enter the mobile phone number of the recipient.

2. Before editing the text of the short message, the default mobile phone number for sending the short message will pop up, and the minor number and the major number can be switched. Just select the minor number.