Indian government activated Mobile Number Portability - MNP service in specific part of the country as test run. MNP allows you to change your mobile operator without changing your existing mobile number i.e. no need to buy a new number. This will be good for all mobile phone customers who want to change their service provider but don't want to change their No.

You have to send a SMS to 1900 to change your service provider. Then they will send you an port number, using that you can change your service provider. You will be charged 19 INR for new connection. The connection charges can be waived if operator wishes. You have to suffer a two hour no service in the time of switch process. You can't change the mobile operator again until 90 days from your previous change operation. Changes only allowed within state and not state to state. GSM to CDMA or CDMA to GSM also possible. MNP will be activated on or before 20^th Jan 2010 in all other parts of the Country.