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How does iphone receive secondary number information?

The specific operation is as follows:

1. Find the settings options on the iPhone desktop you are using, and then click Enter Settings.

2. After entering the settings, click General Options to enter the general main interface.

3. Generally speaking, slide the screen to the bottom, you can see the restore option, and just enter the restore interface.

In the Restore interface, click Restore Network Settings.

4. Enter the password to reset the network, and you can receive the short message of the secondary card.