Can public security network supervisors intercept mobile phone text messages at will?

Article 40 of the Constitution of the People's Republic of China stipulates: Article 40 The freedom of communication and the confidentiality of communication of citizens of the People's Republic of China are protected by law. Except for the need for national security or the investigation of criminal crimes, where the public security organs or procuratorial organs inspect communications in accordance with the procedures prescribed by law, no organization or individual may infringe on citizens' freedom of communication and communication confidentiality for any reason.