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Tremendous Internet proliferation for the last decade has urged users to demand broadband wireless and mobile data communication. Estimation on increasing users' expectations and growing demand for mobile services around the year 2010 requires another new mobile network system with improved capability than 3G or IMT-2000, which is believed to be insufficient to cope with users demand around 2010. This study discusses vision of 4G mobile network systems and phased research and the development approach. The 4G targeting data rate is up to approximately 1Gb/s in low mobility and the 100 Mb/s in high mobility is too adventurous for today. A phased approach will mitigate risk of research and development of many times higher data rate than current state-of-the-art technology.