Apple 1 1 How to switch the primary and secondary cards when sending short messages?

If the Android phone is dual-card, you can choose which SIM card on the SMS editing page, but Apple's dual-card switching is not so simple. How do you switch between the primary and secondary cards when Apple sends a text message at 1 1?

Apple 1 1 How to switch the primary and secondary cards when sending short messages?

1. Open the SMS editing dialog box and click the sender number above.

2. Click the calling number to switch the main and secondary cards.

If it is a new message, just enter the recipient information and click the calling card button to switch.

This paper takes iphone 1 1 as an example and applies it to iOS 15 system.