What do you think of the text messages sent by Apple's mobile phone?

You can only see it if the other party has set a read receipt;

If it is not enabled, it cannot be seen.

How does iPhone set the information that the other party has read?

(1) when you receive a message, the notification bar will drop down the content, and you can browse the content of the message at this time;

(2) If you don't need to reply after reading, you just need to push up to read by default, and the unread mark will not be displayed above the SMS application.

The screen lock interface needs to be set in >; Notification > open "show preview" in the message, and click "reply" after receiving the message.