An electronic mobile device (10; 20) comprising: - a device mode control unit configured and arranged to switch the mobile device from a first operational mode into a second operational mode and vice versa; - an orientation sensor (18; 28) configured and arranged to measure a current orientation of the mobile device; - a processor configured and arranged such that, during operation of the mobile device, the processor: - receives the current orientation from the orientation sensor and stores the received current orientation as a reference orientation of the mobile device, - periodically receives the current orientation from the orientation sensor, periodically calculates a differential angle between the current orientation and the stored reference orientation, and periodically compares the differential angle with a predefined angular threshold value, and - instructs the device mode control unit to switch the mobile device from the first operational mode to the second operational mode if the differential angle is above the predefined angular threshold value, characterized in that a frequency of said periodically receiving the current orientation, periodically calculating and periodically comparing the differential angle is in a range from 5 to 15 Hz, and in that the processor is configured and arranged such that, during operation of the mobile device (10, 20), the processor periodically receives the current orientation from the orientation sensor and periodically stores the received current orientation as the reference orientation with a frequency in a range from 0.25 to 0.5 Hz. - a device mode control unit configured and arranged to switch the mobile device from a first operational mode into a second operational mode and vice versa; - an orientation sensor (18; 28) configured and arranged to measure a current orientation of the mobile device; - a processor configured and arranged such that, during operation of the mobile device, the processor: - receives the current orientation from the orientation sensor and stores the received current orientation as a reference orientation of the mobile device, - periodically receives the current orientation from the orientation sensor, periodically calculates a differential angle between the current orientation and the stored reference orientation, and periodically compares the differential angle with a predefined angular threshold value, and - instructs the device mode control unit to switch the mobile device from the first operational mode to the second operational mode if the differential angle is above the predefined angular threshold value, characterized in that a frequency of said periodically receiving the current orientation, periodically calculating and periodically comparing the differential angle is in a range from 5 to 15 Hz, and in that the processor is configured and arranged such that, during operation of the mobile device (10, 20), the processor periodically receives the current orientation from the orientation sensor and periodically stores the received current orientation as the reference orientation with a frequency in a range from 0.25 to 0.5 Hz. - receives the current orientation from the orientation sensor and stores the received current orientation as a reference orientation of the mobile device, - periodically receives the current orientation from the orientation sensor, periodically calculates a differential angle between the current orientation and the stored reference orientation, and periodically compares the differential angle with a predefined angular threshold value, and - instructs the device mode control unit to switch the mobile device from the first operational mode to the second operational mode if the differential angle is above the predefined angular threshold value,