In this article, an Intelligent Decision System (IDS) is proposed for reducing block call rate in Wideband Code Division Multiple Access (WCDMA). Firstly, the network environment was characterized and parameters that impact on network accessibility studied. From the characterization result, the software related causes of block calls were studied and grouped into cases. We further developed an IDS model that links the various network states and generate an output under a transfer function. The IDS uses cases from previous experience to predict and resolve the network snags that led to block calls. Also, the system performance was validated by comparing the data obtained from real life network with that of simulation and the result shows a great improvement on the system. The novel aspect of our research are the development of a model linking all the network parameters and developing an intelligent decision system that reduces block call in a WCDMA network.