The overall MNP data analysis showed that during last 13 months total MNP requests increased from 3.83 million subscribers to 37.11 million until February 2012. A state wise study showed that the maximum MNP requests (3.94 million) were received in Karnataka followed by Andhra Pradesh service area at 3.46 million and Gujarat at 3.42 million.
http://www.dnaindia.com/money/report_mobile-number-portability-review-in-india-good-or-bad_1684502