As technology continues to evolve, organizations seek to use personal electronics like smartphones for selection and assessment. While this promises to increase access to a more diverse applicant pool, research is needed to examine whether commonly used assessments function similarly on these devices as on a conventional computer. Contrary to past research, we did not find meaningful differences in general mental ability (GMA) test scores between device groups. We also observed few differences in item functioning between devices. Screen size had a positive, but marginal effect on test scores. These results are optimistic for the use of mobile devices in GMA testing, but additional research is needed to examine the functioning of alternative GMA tests administered on mobile devices.