1. A mobile device, comprising: a plurality of sensors and a plurality of sensor groups, wherein each of the sensor groups is assigned at least one of the sensors, and wherein the sensor groups are arranged according to a hierarchy; and a plurality of classifiers, wherein each classifier is assigned to a sensor group, and wherein each classifier is configured to evaluate one or more contexts of the mobile device based on signals from one or more sensors assigned to the same sensor group as the classifier; wherein the mobile device is configured to: activate a classification by a classifier assigned to a first sensor group to evaluate a first context of the mobile device, wherein the first sensor group is at a lowest level in the hierarchy; activate a classification by a classifier assigned to a second sensor group to evaluate the first context of the mobile device after a result of the classification by the classifier assigned to the first sensor group; and adapt a configuration of the classifier assigned to the first sensor group based, at least in part, on a result of the classification by the classifier assigned to the second sensor group.