A mobile telecommunications device configured to log driving information associated with a vehicle is described. The mobile telecommunications device comprises: a sensor set comprising at least one of an image sensor, an audio sensor, an accelerometer and a positioning module, or a combination thereof; a processor; and a memory; the mobile telecommunications device being configured to: determine, based at least in part on sensor data from the device's sensor set, a start of a driving period during which the mobile device is present in the vehicle and the vehicle is in use, process the sensor data from the sensor set during the driving period to derive driving information associated with how the vehicle is driven, mobile telecommunications device being configured to process the sensor data automatically, using a neural network provided in the mobile device, to determine whether the driving information represents an acceptable or unacceptable driving pattern; and store at least some of the driving information to the memory.