Mobile Number Portability

Mobile phone users in india will be able to retain their mobile numbers even if they switch service providers from Dec. 31, according to the india's Ministry of Communications & IT
The new Mobile Number Portability (MNP) facility will be rolled out by then in the nation's four largest cities and some other service areas, with subscribers in other parts of the country getting the facility by March 20, the government said on Wednesday

To read the news item Mobile number portability by December in the hindu