Method and system for validating whether a user of a mobile device is a vehicle driver. For example, the method includes receiving telematics data and device interaction data generated by the mobile device during a vehicle trip, analyzing the telematics data and the device interaction data to determine driving instances in which the user interacts with the mobile device during the vehicle trip, determining whether the user of the mobile device is the driver of the vehicle during the vehicle trip based on the driving instances by using a classification technique, receiving positioning data associated with the mobile device within the vehicle during the vehicle trip, and validating the classification technique based on the positioning data and whether the user of the mobile device is determined to be the driver of the vehicle.