What's the matter of calling the other party to show that the other party can receive the news?

If you can send and receive short messages normally, it means that there is nothing wrong with the number status of both parties, maybe there is something wrong with the setting of the other party's mobile phone, so you can ask them to check the setting;

Generally, this situation may be caused by the settings of the other party's mobile phone, such as blacklisting or prohibiting incoming calls;

If dialing other numbers is normal, it means that the number itself is fine, and the problem of the other party's mobile phone is ruled out. You can also try changing your mobile phone to see if it is a problem with your mobile phone settings.