The invention relates to a method for gender identification of a cell-phone subscriber. There are two main steps: constructing a general model of female and male calling behaviour from a set of variables obtained for each subscriber; and classifying an individual calling behaviour of a subscriber comparing it with the general model. The method includes the step of constructing the general model comprises obtaining a set of data, that may be obtained from calling detail records, that are saved at a database every time a subscriber makes or receives a phone call; computing a set of variables using a set of instances from subscribers who their gender is already known; and applying an algorithm which generates groups labelled as male or female behaviour. Finally, in the step of classifying, the gender of the subscriber is identified by assigning to the subscriber the label of the closest group.