In this work, the aim is to discuss the relative importance of the driving parameters of the  diffusion of innovation under competition. As a case study the competitive existence of Android and iOS operating systems is modelled in the context of an extended Bass model.   The chosen model consist of two coupled differential equations. Each differential equation has the same form of the well known Bass equation with an extra term which  represents the effect of the existence  of the competitor.  Since the smart phones sales and usage are globally well documented,  publicly available  global  smart phone market share and sales data are  used to determine the model parameter values.  The smart phone global market share data spans a  period of 28 quarters starting from the fist quarter of 2009.  The  distribution of the market share  at the first quarter has been used as the initial values of the competing operating systems. The free parameters  (six in total)  of the differential equations   are obtained by an  minimisation process. The values of the parameters are fixed  by minimising the difference between the solution of Bass equation and the smart phone global market share data.   The parameter values of iOS and Android operating systems indicate that, in the global scale,  the adaptation of new ideas/products the dominantly led by the personal interactions.  In fact, through social networks, information flow is immense and individuals relay on the information obtained directly from a trusted individual. Publicity parameter values indicate that very rarely decision of an individual is formed by only the mass media or publicity. On the contrary to the publicity parameter it is observed that the existence of a competitor has considerable effect on the sales of both parties. 

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