There is a growing need to understand IT consumerization, which is the adoption and use of consumer technologies by employees in the workplace. Employees want to use consumer technologies at work and, increasingly, organizations recognize the benefits of encouraging extended and innovative use of employee-owned technologies for work purposes. While the information systems (IS) field has converged on factors influencing individuals' acceptance and use of organizational IS, we do not know if these have utility in the context of IT consumerization. To that end, this study evaluates relationships between factors that have been posited to influence use of consumer technologies in the workplace and actual behaviors of individuals using personal smartphones for work purposes. Our results indicate that IT consumerization is driven by different factors than acceptance and use of organizational IS, suggesting that new theories and new conceptualizations of use are needed to advance understanding of the phenomenon.