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The new age of 4G technology is upon us which is about to reshape our lives. 4G offers us greater bandwidth, higher data rates, efficient spectrum use, and increased interoperability across the globe. It supports user friendly, innovative, and secure application environment. 4G systems are expected to become a platform capable of providing seamless integrating between the existing systems like GSM and wireless LAN. These systems will support comprehensive personalized services, providing stable system performance and improved quality of service. With these enhanced capabilities 4G promises to bring wireless experience to a whole new level. User will now have access to sophisticated GUI, real time gaming and high definition video. This paper will explore benefits, challenges, Multiplexing techniques and standards of 4G technologies. In it next generation applications and integration is discussed. Solutions to the research problems in developing 4G technologies are examined. Finally a short summary on 5G vision is presented as a continuum of features in the development of mobile technology.