Excuse me, what happened when I received the text message and sent a report but the other party didn't turn it on?

Showing that it has been sent does not mean that the other party must turn on the phone. It only means that this message has been successfully sent to the server and then forwarded to the user by the server, because the message we sent is not peer-to-peer. They all go through the server. But what is certain is that when it is opened, the other party will receive your message.