4G (also known as Beyond 3G ), an abbreviation for Fourth. Generation.4G is the next generation of wireless networks that will overpower the 3Gnetworks. It is made to meet the customer expectations with better speed .It I IP based and provides IP address to all the users in the network.4G is all about an integrated, global network that will be able to provide a comprehensive IP solution where voice, data and streamed multimedia can be given to users on an "Anytime, Anywhere" basis. At present we have many technologies each capable of performing functions like supporting voice traffic using voice over IP (VoIP), broadband data access in mobile environment etc., but there is a great need of deploying such technologies that can integrate all these systems into a single unified system. 4G presents a solution of this problem as it is all about seamlessly integrating the terminals, networks and applications. The race to implement 4G is accelerating as well as quite challenging. The aim of this paper is to highlight the implications and opportunities of 4G networks.