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The main aim of our work is to explore the social and gaming attributes of multi-user collaborative mobile phone games. For these purposes, considering the performances of the contemporary converged mobile phones, we have developed and augmented reality (AR) TeamTwixT game for mobile phones. The game is characterized by shared physical space that promotes physical awareness among co-located players and provides a social user experience that leverages the desirable features of both traditional game forms such as board games and that of modern video games. We have evaluated the social interaction between team players, system performances, user interface performances by adopting the Fitts' law and the usability of mobile phones for collaborative AR. The results have shown that, despite the small screen and limited input capabilities mobile phones and 3D AR technology can be used to naturally enhance the interaction of co-located players and increase their confidence in respect to other gaming conditions.