Mobile phones often can't receive messages sent by others. What happened?

Does it happen from time to time that mobile phones can't receive short messages sent by others? Or can't you get the text messages sent by others?

What are the news that I can't receive? Unicom, Mobile or Telecom, or all of them?

General recommendations:

Is the inbox full? Will it be like this after deletion?

Give yourself a try? See if you can get it.

Is there any software installed in the mobile phone that can block some short messages (such as SMS housekeeper)? For example, we should set up a black-and-white list of short messages.

If it only happens from time to time, and it is irregular, uncertain (that is, all users may not receive it), the inbox is not full, and the software is not installed, then you should consult the operator and let them find out which number you can't receive the SMS (it is best to provide two numbers of the same operator for them to inquire), and they can solve it for you.