http://www.rediff.com/business/slide-show/slide-show-1-tech-number-portability-is-finally-here-how-to-go-about-it/20101125.htm

India on Thursday ushered in Mobile Number Portability that will allow cellphone users to switch operators without changing numbers, with Telecom Minister Kapil Sibal launching the service in Haryana.

The consumer friendly service was mooted over two years ago and was planned to be implemented by end of 2009.

Mobile subscribers in Haryana will have to pay Rs 19 to switch between operators present in the state.

The rest of India would get to use MNP from January 20, next year.
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However cumbersome the process is (what is easy and straight in India), at least its here now. We can see some price wars.