Summary form only given. Today, there is a generally held view that the next step for wireless technology is a natural progression to support high data rates over a wide area and facilitate roaming among a variety of systems. 4G wireless has the potential to provide these features and many more, which can significantly change the way we use mobile devices and lead to a wide variety of new applications. However, such technology doesn't come without its challenges. Some of these challenge are radio access methodologies, mobility management across different networks and the physical and functional model to be employed. This paper aims to give an insight into these issues, outline some of the proposed solutions to these problems and identify some of the benefits of this technology.