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Mobile communication technology of today's time have many loop holes in it. May it be the security concerns or may it be not so successful MNP (i.e. Mobile Number Portability Service) or lack of user satisfaction etc. This paper deals with an optimal solution for the entire above stated problem and much more similar kind of problems which presently exists in Mobile communication. For this, a new number allotment scheme will be used which can very well be implemented with the currently used SIM card system. These new numbers will be allotted per person basis and not on SIM card basis. Though in first look, it might seem that this will lead to an over burdened database server, but going through the paper one will actually realize that this will decrease the burden on data base, will increase its efficiency, will be highly secure and will also stand on users expectations from any mobile communication device. We propose a new algorithm that is number allotment method with UTNA security system for mobile user, which is very useful in terms of security, user identification, how many SIM numbers a user have and other various crucial concerns.