The Mobile Number Portability (MNP), which allows a mobile subscriber to change his service provider without changing his number, will come into force across the country from 20th of this month. A notification to this effect was issued by Telecom Regulatory Authority of India (TRAI). The MNP has already come into force in Haryana in November last year. The facility allows consumers to retain their mobile numbers while switching operators. It gives rise to genuine competition, leading to an improvement in the quality of service of telecom company.