What are the steps to apply for Mobile Number Portability (MNP) Services in India?

The Mobile Number Portability (MNP) service has finally arrived in India and mobile users of the country can now make use of it to retain their mobile number whenever they would like to change the Mobile Service Operator. It is a very good initiative and may be very helpful for all the mobile phone users in India to avail the best tariff plans from the respective mobile operators without having