1. A context aware system for use in a mobile device, the context aware system comprising: a context change detector (CCD) configured to receive sensor data from one or more sensors of the mobile device and to detect a change in a current context state of the mobile device based on the received sensor data without determining what a next context state of the mobile device will be; and a context classifier (CCL) coupled to the CCD, wherein the CCL is configured to transition from a low power consumption mode to a normal power consumption mode in response to the CCD detecting the change in the current context state, and wherein the CCL is further configured to determine the next context state of the mobile device while in the normal power consumption mode.