Method for alerting executed by a portable device in a mobility situation associated with at least one telecommunications network, the portable device comprising at least processing means, storing means and means (A, DM, M) for receiving or transmitting data over the network, the method comprising at least: - a step for initialising at least one analysing module, initialised as a function of data representative of a predetermined context of use comprising at least data representative of at least one state of at least one sensor, the analysing module comprising at least one evaluation module evaluating at least one alert variable (V01, V02, V03), - a step for initialising at least one surveillance module (M01, M02, M03) initialised as a function of the context of use, the surveillance module setting the evaluated alert variable in a state representative of the state of said sensor or of another sensor (CM01, CM02) associated with the surveillance module, - a step for initialising at least one module (102, 1021, 1022) for transmission of an alert initialised as a function of the context of use, controlled as a function of the evaluation of the alert variable by the evaluation module and triggering, during its activation, at least the sending of an alert message by the means for transmitting data over the network or by other means for transmission, - a step for setting prior to the activation at least the module for evaluation, surveillance or transmission of an alert, the setting being carried out via the user interface, - a step for activation of the analysing module and its evaluation module, - a step for setting the alert variable by the surveillance module associated with the context, - a step for activation of the module for transmission of an alert when the evaluation module detects a state of emergency. - a step for initialising at least one analysing module, initialised as a function of data representative of a predetermined context of use comprising at least data representative of at least one state of at least one sensor, the analysing module comprising at least one evaluation module evaluating at least one alert variable (V01, V02, V03), - a step for initialising at least one surveillance module (M01, M02, M03) initialised as a function of the context of use, the surveillance module setting the evaluated alert variable in a state representative of the state of said sensor or of another sensor (CM01, CM02) associated with the surveillance module, - a step for initialising at least one module (102, 1021, 1022) for transmission of an alert initialised as a function of the context of use, controlled as a function of the evaluation of the alert variable by the evaluation module and triggering, during its activation, at least the sending of an alert message by the means for transmitting data over the network or by other means for transmission, - a step for setting prior to the activation at least the module for evaluation, surveillance or transmission of an alert, the setting being carried out via the user interface, - a step for activation of the analysing module and its evaluation module, - a step for setting the alert variable by the surveillance module associated with the context, - a step for activation of the module for transmission of an alert when the evaluation module detects a state of emergency.