Chapter from the following book: Tremblay M, Lavallée P, El Haj Tirari M. Survey Practices and Methods. Paris: Dunod; 2011. 382 p. After briefly introducing the Health Barometers—surveys conducted by the National Institute for Prevention and Health Education (INPES)—and reviewing current data on telecommunications in France, this chapter presents an original method for accounting for full unbundling and demonstrates how individuals in this situation differ from the rest of the population.