The study of corporate social responsibility has been the object of much research in recent decades, although there is a need to continue investigating its benefits as a marketing tool. In the current work we adopt a multi-dimensional perspective of social responsibility, and we carry out market research to determine the perceptions of users of mobile telephone services about economic, legal, ethical and social aspects of their operating companies. With these data we determine the structure and components of the concept (...) of social responsibility. Subsequently, this is related with the overall evaluation of the service and loyalty by means of a model of structural equations, in order to determine the influence of corporate social responsibility on these concepts, and hence its benefits as a commercial tool. (shrink)