To verify the originality of your IMEI number one can send a message “IMEI <15digit> to 53232
MSAI is exclusively authorized body in India by GSM Association (GSMA) to perform Genuine IMEI Implant program (GII). You can implant the genuine IMEI numbers on to the mobile handsets which are carrying bad/non genuine IMEI numbers .
http://www.msai.in/registration.html
Your nearest GII center locator

Yes, just pay Rs.19 (or Less )and change your Moble operator without changing a single number of your existing mobile number. Operators are free to charge less than Rs 19, the telecom regulator has said. Mobile users can change service providers while retaining their old numbers intact by paying s 19, as per Telecom Regulatory authority of India (TRAI) instruction.
Mobile number portability will be implemented in the metros and some other circles by December 20 and across India by March. To change operators, a subcriber will have to request the new operator for a connection. The process will have to be completed in four days and the subscriber will have to give portability charges (ie. Rs.19 max)to the new operator.
The facility helps to increase competition among service providers and acts as a catalyst for better quality service.