In the SPUTNIC study, we measure the individual exposure to mobile phone radiation, and how this affects cognitive health. Goal of the study is the personal measurement of exposure to mobile phone radiation using a smartphone application in 100 volunteer participants in Basel Stadt. The same participants will take cognitive tests on ten days, and fill out a short questionnaire daily about their daily consumption of alcohol, caffeine and medication, as well as their daily health. They will also carry an activity tracker (Fitbit) on the wrist. The daily variability in the cognitive scores, the health-related quality of life, and the sleep quality will be studied in relation to the daily exposure to mobile phone radiation. We will correct the analysis of sleep quality for the daily noise level experienced during the night, which is measured on the bedroom window for the duration of the study. The analysis of all measurement data (cognitive tests, questionnaires, apps, noise measurements) happens in Basel. Anonymized results will later be compared to those of Besancon, France, where the study takes place in similar size.