How to send text messages when Apple changes its mobile phone number?

Apple uses the last contact number by default when sending text messages. If you need to change another mobile phone card to send a message, how can Apple send a text message by changing its mobile phone number?

How to send text messages when Apple changes its mobile phone number? 1. Open the SMS editing dialog box and click the sender number above.

2. Click the calling number to switch the mobile phone number to send SMS.

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

This paper takes iphone 13pro as an example and applies it to iOS 15 system.