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Mobile computing is considered as low-end computing systems. It currently dominates almost all aspects of our lives from mobile banking to mobile purchasing to mobile skypeing, etc. With the increasing demand of smart phones in today's world, making the system secure is very important. Software architecture plays an important role to achieve both functionalities and quality (e.g., security) of a system. This paper surveys the software architecture of five of the leading mobile operating systems such as Android (Linux), Blackberry, iPhone (Mac OS X), Symbian, and Windows Mobile. Our survey study indicates that Android is the most promising of al and identifies security issues with Android. The paper then proposes improved software architecture to resolve these issues. More specifically, our proposed software architecture attempts to enhance the security of Android without comprising it performance.