Facility of Mobile/Cell Phone Number portability(MNP) is from Novmbr 1st 2010

The Department of Telecom announces MNP from November 1......
“November 1 onwards MNP would be operational partially... We wanted to inaugurate it in Haryana,” Mr. Raja told reporters in New Delhi.
The Telecom Minister Mr. A. Raja said the Mobile Number Portability (MNP) facility, will be rolled out from November 1, starting with Haryana. MNP allows subscribers/users to retain numbers even after changing service operators. The service is expected to be rolled out in the rest of the country in later phases.
The implementation of MNP is already delayed thrice due to various reasons. One of them is lack of necessary infrastructure in place.
The Department of Telecom had given licences to Syniverse Technologies and MNP Interconnection Telecom Solutions, a 74:26 joint venture between U.S.-based Telcordia and Deepak Talwar Consultants to implement MNP.