Method of power management for a handheld mobile computing and communiation device

A process of managing power supply of a handheld mobile computing and communication device powered by a battery system, wherein the device comprising a mobile phone including a first communication unit, and an emergency operation unit comprising a second communication unit and a sensory unit for detecting survivability of a trapped person, the process comprising steps in the following sequence:

• supplying the power from the battery system to enable operations of the mobile phone;
• measuring the remaining power of the battery system at a predetermined frequency;
• switching off the mobile phone if said power is below a predetermined threshold;
• supplying the power from the battery system to enable operations of the emergency operation unit at a low power mode, wherein the second communication unit is operated as a receiver only and said sensory unit is powered off;
• receiving an authorized signal from an external mobile rescue station;
• supplying required power to the output unit for providing alert signals, including an event of notable vibration of the device or ring tone signals, to a trapped person associated with said mobile device;
• supplying required power to the sensory unit for sensing survivability of the person by detecting an interaction or interactions of the person with the device;
• supplying required power to the processor for processing data collected from the sensory unit;
• and
• supplying required power to the second communication unit for transmitting a data file including said data collected from the sensory unit to the rescue station.