Starting with the 4G, mobile networks made a huge change in wireless network environment. The global roaming in mobile network is a fastest way of communication in the world. 4G supports the quality of service of global roaming across multiple wireless and mobile networks. Many researchers are showing interest in 4G wireless networks that assist global roaming across multiple wireless and mobile networks. For example, cellular network to a satellite-based network, and satellite-based network to a high-bandwidth wireless Local Area Network (LAN). The purpose of this research is that the mobile users get a huge range to connect with other mobile users at ?any time? and ?any where? in the world and mobile users get free global roaming over all mobile networks. This research work provides better security to the mobile users and gives facility to users that authenticate with the network through fast handoff and authentication accounting protocol. The propose research work is to develop a better multi data path bandwidth in WLAN to use bandwidth in efficient way using the 4G wireless mobile network and provide effective roaming to the mobile users over all IP by using the 4G mobile network. The mobile IPv6 protocol provides the quality of service and global roaming to the mobile users. The mobile users transmit audio video data over the network without congestion and data forward without delay. We compute the accurate bandwidth that transmit over wireless network and check the path of data packets that are sent to the network. Handoff management is used to check the bandwidth from sender side and receiver side. We develop a complete IP based 4G network that users can choose their application and control their network services. The mobile users get the high quality of voice, higher bandwidth, higher bit rate and good quality of service.