In today’s Digital Age, smartphones are omnipresent. Compared to other digital devices, smartphones are more accessible and thus more invasive and disruptive. Thereby, smartphones cause self-control challenges in people’s everyday lives. In order to better understand the drivers and consequences of smartphone use, we need to shed light on the underlying psychological processes. The present pre-registered study seeks to test the hypothesis that higher trait self-control leads to less pronounced self-control failure through the use of one’s own smartphone. Further, we will investigate whether the automaticity in individuals’ smartphone use (i.e., habitual smartphone use) mediates this link between trait self-control and self-control failure via the smartphone.