How to switch text messages on iPhone to text messages?

The steps for how to switch to text messaging from iMessage on an Apple phone are as follows:

1. Find and open "Settings" in the menu.

2. Find and click to open "Information".

3. Click the green button to switch to "SMS" mode, and turn it on again to turn on "iMessage" mode.

4. After closing, click and open "Information" at this time.

4. After opening "Message", select and open a text message.

5. After opening any text message, "SMS/MMS" will appear in the red box in the picture below. At this time, it has been switched to SMS mode and text messages can be sent normally. If "iMessage" is displayed in the red box, it is "iMessage" mode, please distinguish it.