Due to the increasing use of cellular networks for data transmission, mobile telephone operators are facing a dramatic raise in using radio resources to supply their demand. As a result, they are being forced to migrate to new technologies that provide high spectral efficiency, allowing an optimized use of available spectrum. This work describes the development of an advanced tool to analyze the operator management of radio transmission for personal mobile systems. The model was built considering well-known propagation, mobility, voice and data traffic for transmission assumptions, in order to approximate the developed tool to the real world mobile systems. The simulation tool is suited for GSM/HSCSD networks allowing engineers to optimize the efficient use of the available spectrum. It also permits the evaluation of system capacity as well as the analysis of power control and handover strategies. Another application exploited in this work is the investigation of resource allocation algorithms. A new algorithm for resource allocation in integrated voice and data environments was proposed and its performance was evaluated using the simulation tool.