Will someone send a text message after the phone number is down?

Of course, you can't get messages. Whether it's downtime or arrears, you won't get a text message from the other party. In fact, the transmission was unsuccessful. There is no short message to prompt the sender, but if the other party's mobile phone has the function of prompting whether the short message was sent successfully, he can judge that the short message was not sent successfully from the sending state, but he can't judge why it was not sent successfully!