Universal Mobile Telecommunication System (UMTS) networks can provide a platform for mobile packet data and multimedia services. Written by Finish experts in mobile networking, this work describes the latest UMTS mobile networking technology, discussing both the core network evolving from the globally successful GSM/GRPS system and the radio access network based on emerging wideband Code Division Multiple Access (CDMA) technology. The information is useful for system, software, and field engineers and technical managers in cellular operator, manufacturer, and service provider companies, as well as students of telecommunications engineering and computer networks.