Pan Indian Mobile Number Portability, which would enable mobile phone users to switch service providers even when they move from one state to other, may be a reality by as soon as April 2014 as the Telecom Regulatory Authority (TRAI) has mandated mobile phone companies to implement full number portability within six months.
Till now Mobile Number Portability only allow users to shift between service providers in a particular circle. For instance, if you have a number registered in Delhi circle, then at present you would only be allowed to move to any service provider within this circle.
Full MNP was expected to be implemented way back in February this year itself but was delayed due to opposition from service providers. In fact, National Telecom Policy (NTP) 2012 had also emphasised the implementation of national number portability.