How to use iphone to know whether a message has been received by the other party?

All mobile phones can only know whether the sender sent it successfully or not.

When Apple's mobile phone sends, there will be a small green bar sliding from left to right. When swiping to the right, the phone will make a sound, indicating that the message has been sent successfully.

If the transmission is unsuccessful, there will be a hint of transmission failure, which just shows that your signal is not good.

If the other party shuts down, it is also prompted as above.