As mobile is new technology in financial and banking sector. This technology help us to save our time and provide facilities to get the information about our account, transaction and transfer the money from one account to another account from anywhere and anytime but there is problem in customer adoption, customer distrust on the mobile banking security. This is a big problem in front of mobile banking. So first of all we have to make trust on the customer by increasing security in mobile banking services and make it user friendly due to which user can use it in an easy way. The main objective of this paper is to disuse about mobile banking, advantage and benefit of mobile banking and security issues & challenge in mobile banking and get solution of mobile banking security.