Since August 2022, the use of cell phones in Swedish schools is regulated by law. In this study, the implementation of the cell phone ban is studied from the perspective of upper secondary school teachers as an example of implementation within a street-level bureaucracy setting. Interviews were conducted with eight teachers to examine what factors they experience as affecting the implementation, how they act while implementing the ban, what discretion they experience in the implementation and what their opinions on discretion are. The study shows that the teachers generally understand the law and its implementation, but that knowledge-related issues concerning for example the implementation in specific situations exist. The willingness to implement varies among the teachers, which mainly seems to be connected to their views on cell phone use in the classroom and – in some cases – views on policy efficiency. Some teachers also have issues implementing the ban due to lack of time, information and support from colleagues, the number of students they must keep an eye on, and students opposing the ban. While several teachers collect the students’ phones or tell them to put them away, there are also those who do not act to implement the ban or only do it in certain cases. Finally, the teachers all experience discretion and find this positive, but some teachers see issues with other teachers having discretion and not implementing the ban.