What version does Apple's mobile phone echo effect need to see?

The echo effect of Apple mobile phone can only be seen if two people are the same version.

1. First, open the short message and enter the object to be sent. 2. Enter what you want to send, and then press and hold the green send button on the right. 3, and then click on the screen, select the echo effect, you can see our screen effect. 4. After the selection, click the green send on the right. There will be a full-screen special effect display after sending.