Call the other party's mobile phone. DuDu. It says "The number you dialed is busy". Then you can get through the landline. What happened?

The other party has blacklisted you. He should be able to see the record when he calls, but he just won't answer.

Text messages should be visible if they are not blacklisted.

Generally, incoming calls are black screens. If there is no beep in the past, it will directly remind the user that he is busy or on the phone, which proves that he is indeed on the phone. If there is a beep, it is usually a black screen.

Extended data

Prompt tone:

1. Fixed telephone: When calling a traditional fixed telephone, if the other party is busy, you will hear a hurried busy tone, and the telephone signal will be automatically cut off after three consecutive rings.

2. Mobile phone: If the other party is busy when calling the mobile phone, you will hear a voice prompt. The content reads: "The number you dialed is busy, please redial later." Then there will be corresponding English tips. According to different network operators and different provinces, voice prompts will be slightly different.

3. PHS: When calling the original Netcom PHS phone, if the other party is busy, you will hear a continuous message: "The subscriber you dialed is busy, please redial later".

Reference: Baidu Encyclopedia: Busy Phone Signal