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The Universal Mobile Telecommunications System (UMTS) as a 3rd generation mobile telecommunications system is designed to provide mobile Internet access to the user. E-mail and World Wide Web (WWW) browsing sessions as mobile data service applications are examined for performance analysis by simulation. A WWW traffic model is presented as the basis of a WWW load generator. The paper presents this traffic load generator integrated into an event driven, bit accurate UMTS radio interface simulator (URIS). The simulator is based on a detailed implementation of the standardized UMTS protocol stack extended by the Transmission Control Protocol (TCP) and the Internet Protocol (IP). Simulation results of quality of service parameters like delay and throughput depict the performance of mobile Internet access over UMTS.