Why has the QQ message been sent, but the other party hasn't received it? What happened?

Maybe the other party has a bad signal, or you have a bad signal.

This is what happened to me. Sometimes, my message is sent out, but the other party doesn't receive it. I didn't prompt that sending failed. Then I checked the roaming message when I used the computer QQ, but I lost the message when there was no message from me.

2. Maybe the other party hacked you. You can send a message as usual after the other party blackmails you, but the other party can't see your message. ?

3. It may be that the other party blocked you. Blocking your message is of course invisible.

It is also possible that the other party lied to you. Of course, this rarely happens.

5. There may be something wrong with 5.QQ software, so you can download it again.

6. It may be that the mobile phone card is stuck.