Why doesn't the mobile phone display the number when accepting short messages?

This may be that the other party has opened a hidden number service. As long as you call the operator's customer service phone with your number, you can open this service, even if you send a text message, you can't see your number.

At present, Unicom has opened a "shadowless SMS" service for Jiangsu users, and the number is directly added with 80. After receiving the short message, the other party will see the ID number automatically generated by the system, not the sender's mobile phone number.

Mobile users can also use the SMS hidden number service. Dial 0 1 1230 before the mobile phone number, and the number will be automatically hidden in the sent message. The receiver only sees the virtual number, so it is impossible to know who the sender is.