With the rapid advancement of mobile technology, smart devices have challenged the extant research concerned with time and space. Based on a user’s specific interests, mobile portals allow quick and easy access, anywhere, anytime to a world of data, applications and services. Whilst this provides an enhanced, dynamic and personalized user experience, knowing how satisfied users are with their mobile portal is crucial to understanding users’ needs, identifying important factors in the improvement of existing mobile portals and enhancing Information Technology (IT)-related business value. The study extends research knowledge about user satisfaction to the context of mobile portals. Secondly it contributes knowledge regarding mobile portals, particularly concerning post-adoption mobile portal user satisfaction. Thirdly, the research contributes a new reliable and valid instrument to measure user satisfaction with mobile portals – a contribution to the research stream within the IS literature concerned with measurement.