Dialer / Call application is very important among all the applications in any mobile phone and essential for all users. Call failures are common though, can be reduced by examining and tightly knotted with proper inter-process communications. In this paper we examined call sequence differences of Kitkat and Lollipop and their inter-process communications. Discussed the dependencies of inter-process communications by pointing the crucial changes, pitfalls, and risks in call handling and

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... ity thereof. Concluded with some suggestions to reduce inter-process dependencies to improve call success rate.