This paper fully based on the mobile network technologies . We have various mobile network technologies .Every generation has some advantages and disadvantages .Every generation improve the some feature from the previous generation. User wants to much faster mobile internet and fine qualities .User wants to everything in his mobile phone like call system, massaging, data uses (internet on mobile), e-mail, online games etc. These all are used in a fourth generation mobile network properly. 4G is the next generation of wireless networks that will totally replace 3G networks. It is supposed to provide its customers with better speed and all IP based multimedia services. It provide us everything like voice (calling system),data uses ,and other all things .Previous generations are not much faster as a compared to fourth generation mobile network technology . Although 4G wireless technology offers higher data rates and the ability to roam across multiple heterogeneous wireless networks, many Issues required to further research and development. Fourth generation solve the problem which are still remaining in third generation mobile network . One terms used to describe 4G is MAGIC—Mobile multimedia, anytime anywhere, Global mobility support, integrated wireless solution, and customized personal service. So this paper gives the overview of the various mobile network technologies. Keyword:4G,3G,2G(LTE),OFDMA,SDR,EDGE,HSPA+