This documentary exposes radio "hotlines", extremely popular radio programs since the early 1970’s. At times with humour, points of view by media critics Franchie Jarraud and Jacques Normand are presented along with interviewers and listeners. The importance of radio and telephone for mass communication is exposed. The history of this type of radio show, which has given listeners direct access to the host, has opened radio to new subjects and is traced. The validity of this kind of show functions as a tool for information and includes actual listener participation which is put into question.