Xiaomi's short message was hacked. What icon will he have over there?

If you blacked out the other party in the short message, or the other party blacked out you, there will be no prompt.

Because hacking is the behavior of the mobile phone system, not the behavior of the operator, there is no hint when setting the number to send a message in the future; That is to say, if your number is hacked by others, you can still send a short message to the other party normally, and you will also receive a prompt that the short message was sent successfully, but the other party has blacklisted your number on the mobile phone or software, so the other party's mobile phone will not show that you received your short message.