Mobile phones and smartphones have evolved to be very powerful devices that have the potential to be utilized in many application areas apart from generic communication. With each passing year, users see increasingly powerful smartphones being manufactured, which have a plethora of powerful embedded sensors like microphone, camera, digital compass, GPS (Global Positioning System), accelerometer, temperature sensors and many more. Moreover, the ability to easily program today’s smartphones, enables them to exploit these sensors, in a wide variety of application such as personal safety, emergency and calamity response, situation awareness, remote activity monitoring, transportation and environment monitoring.