Wireless Network is used for all Portal Electronic Devices (PED). The main concept of using Authentication Network in PED for Online Banking. The user authenticates the transaction has a strong static ID and password. SMS based OTP provides an additional security layer for an authorized person. All Banks provide the same process for security purposes for they are beneficiaries. According to the recent thread, it is also vulnerable to various attacks. In this paper how it does can happen and what is the mechanism to prevent security-based OTP throughout using IMEI.