The proliferation of mobile information systems are challenging IS researchers to re-examine some of the temporospatial assumptions embedded in established IS theories. While adoption and use of information systems has a substantial body of knowledge does not seem to have captured some of the temporospatial specificities of mobile technologies such as system portability. The purpose of this paper is to demonstrate how system portability could be incorporated into technology acceptance models. In order to achieve this goal, it proposes a conceptual model and sets the initial ground for the development of a System Portability scale.