Can historical content be queried online? China Unicom mobile phone short message

Because the short message content involves personal privacy, it is impossible to query the short message content. Log in to Unicom's online business hall through the mobile phone number and service password, and enter "phone bill inquiry", "detailed list inquiry" and "short message detailed list" to inquire about the sending records of short messages, including the sending time, the other party's number and other information, but it is impossible to verify the content of the sent short messages.