I used China Mobile's mobile phone to send a short message to PHS of China Telecom, but how did the sender know who I was? Thanks in advance.

When a mobile phone sends a short message to PHS, add "106 and area code" before the sending number. To know the sending number, check the sending object in the SMS sending box. If some mobile phones don't have an outbox, you can log in to the mobile online business hall to check the detailed list of this month and query the sent number according to the sending time.

Now, obviously, the other way is more difficult. Unless you have friends in the billing center or network management center of the mobile company, people with certain system permissions can enter the mobile BOSS system to view the content of short messages. Sometimes, in order to solve a case, the public security department will apply to the mobile company through the Public Security Bureau. After obtaining the consent of the relevant departments, the mobile company can ask the public security to check the phone bill and text message content of the suspect.

Dude, it's a little hard.