The Study "Impact of Mobile Number Portability (MNP) on telecom services" attempts to analyse the impacts of MNP on all stake holders especially customers. Study is limited to City of Bangalore and cities nearby. This research is particularly interested in investigating subscribers' behaviours and perceptions such as motivations of changing or remaining with mobile carriers (operators) with the introduction of MNP. The availability of MNP has been thought to bring substantial benefits to subscribers: lower price, greater choice, higher quality and a greater range of services The outcome of our study - In India Mobile number portability (MNP) won't impact much on telecom industry because as per the survey only 5% to 10% are willing to opt for MNP.