Adhikary, Dhruba creator Phan, Minh Dung Chairperson Rajatheva, R.M.A.P Examination Committee Kovalainen, Mikko P. Examination Committee High Level Commission for Information Technology (HLCIT), Nepal Scholarship donor Asian Institute of Technology Fellowship Scholarship donor text series technical report th Pathum Thani, Thailand Asian Institute of Technology 2007 continuing eng 44 leaves : ill. Recently there have been the concerns over the field of mobile phone technologies and in mobile operating system. It is found that mobile phones are vulnerable to the some sort of security issues. This vulnerable may be occur due to the faults occur in developing the operating system and also in manufacturing the hardware. This research only focuses on the software part rather than on the hardware part. This research analysis the faults that are occur in mobile operating system. It focused on the security models that have been used in the operating system. It will briefly describe the implementation of the Bell-LaPadula and Biba model in the current operating system. A research study submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Information and Communications Technologies, School of Engineering and Technology Research Studies Project Report (M.Eng.) - Asian Institute of Technology, 2007 Mobile communication systems Security measures Asian Institute of Technology. http://203.159.5.9/ait-thesis/detail.php?q=B10628 http://203.159.5.9/ait-thesis/detail.php?q=B10628 071212 20260817162546.0