Can Unicom mobile phone card check the messages sent and received?

Unicom can find out the specific time of sending SMS and the mobile phone number it received by querying the detailed list of SMS and MMS, but it can't find out the specific content of SMS. In fact, it is equivalent to finding only the short message track, but not the specific content, because it involves personal privacy, and Unicom has no right to display it. I can't find the record of receiving the text message.