This article studies about how Reliance Jio made grand entry in the Indian Telecom market and how market got affected with its strong strategies and how it gave tough competition to the existing top telecom companies and made quit the small players of the market and this article shows how the Reliance jio became the market leader  and changing preference of people to have jio as secondary sim card in initial days to moving to first sim slot and making it to have only Jio as primary one. Jio was successful in giving tough competition to the top players of the market by giving free calls, messages and data services in the initial days.