A mobile communication device and associated method are provided. The device includes a positioning unit, configured to provide position information of the mobile communication device, and a processing unit, configured to detect an approach to a first geofence according to a plurality of contexts associated with the mobile communication device, turn off the positioning unit when not detecting the approach to the first geofence, and turn on the positioning unit when detecting the approach to the first geofence. The contexts include at least one cellular context and at least one personal context or multimedia context, and the processing unit is further configured to prioritize at least one of the cellular context and the personal context or the multimedia context over the other contexts, for detecting the approach to the first geofence.