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Fourth generation (4G) mobile systems and services will mainly be characterized by a horizontal communication model, where different access technologies such as cellular, cordless, wireless local area network (WLAN), short-range connectivity, and wired systems will be combined on a common platform to complement each other optimally for different service requirements and radio environments. To access different wireless networks, multimode user terminals are essential. The most promising way of implementing multimodal user terminals is to adopt the software radio approach. The current software radio technology does not meet the requirements of different wireless networks; because it is impossible to have just one antenna and one LNA (Low Noise Amplifier) to serve the wide range of frequency bands. The software radio devices, after scanning the available networks, will load the required software and reconfigure themselves for the selected network. Each downloading method has its own advantages and disadvantages with respect to speed, accuracy, resource usage, and convenience. In this paper, the authors propose a novel idea using CI/OFDM (Carrier Interferometry-OFDM) to access multiple networks using a wireless terminal. The physical size of the wireless terminal proposed in the present work, will be smaller than the terminal with software radio device, and enough memory can be inserted in the terminal device to store software for all networks.