How does Apple's mobile phone know that the message has been received?

When both parties use Apple phones, how do you know that the messages you sent were read by the other party?

Turn on step reading mode

Tool materials:

iPhone

operational approach

0 1

IPhone information can only be read and unread through imessage.

02

You can set the IPhone SMS reading receipt.

The specific setting steps are as follows:

First enter the desktop "Settings";

Second, enter the "information" below the settings;

3. Turn on or off the "Send Read Receipt" switch as required.