Check the recent text messages.

As you said, if Unicom has a mobile phone number, you can check the short message list of this number through the online business hall and the mobile phone business hall, and you can check the other party's number and the sending time of the short message, but you can't check the content of the short message. You can check the detailed list of the last six months. When querying the detailed list, you need to log in through the mobile phone number+modify service to view the detailed list.