We report on a study in which we examined the work habits of six students who agreed to use do not disturb on their phone while working on programming assignments. Two students tried do not disturb, and quickly quit using it. Three out of four remaining student participants were more productive while using do not disturb when working on their projects. These students exhibited different work patterns, different levels of receptiveness, different use of do not disturb, and different phone use, suggesting that using do not disturb has the potential to increase productivity for some students. Our study provides the first quantitative measurements of productivity with phone/no phone conditions in a computing education setting by using keystroke data. In addition, our study is the first that we know of in any setting that measures engagement with high temporal fidelity. Additionally, we surveyed 195 computer science students about their use of do not disturb and willingness to try it. About half of respondents said that they have used do not disturb and most of them use it at least occasionally. [For the complete proceedings, see ED675485.]