Heh, reminds me if my university period. In the students house each apartment had a phone with the round dialing physically removed as the phones were supposed to be used only for recieving calls. I tried the technique you are referring to and it worked perfectly. Too bad that after some months the administration noticed the receipts from the phone company and me and the other guys living in the same apartment had to pay part of it.
Out of curiosity, how did you notice folders were full of child porn? Do operators have access to mail folders and / or use to check randomly on people emails?