Why does the free SMS received by Yixin not show the mobile phone number, but only the nickname?

The reasons why the free SMS received by Yixin does not display the mobile phone number, but only displays the nickname are as follows: 1. In a certain time interval (24 hours), the same sender sends a short message to the receiver, except for the nickname+mobile phone number in the prefix of the first short message, only nicknames are kept in other short message prefixes; 2. There are more than three messages exchanged with each other, and the system defaults that the two people are completely familiar with each other. Then when the sender sends a message to the same recipient in the future, only the nickname is kept in the prefix of the message, and there is no time limit for displaying the nickname. Guizhou users pay attention to China Telecom's customer service in Guizhou. The official account of WeChat can be paid by WeChat, and the phone bill can be recharged with one click. Traffic, points, bills and detailed bills can be operated by themselves, which is convenient and fast. Customer service 40 will answer your questions.