Pre-registration for a study addressing the following research questions: 1) How serious do the general public consider the potential health risks of 5G mobile technologies to be compared to other RF-EMF emitting technologies (including previous generations of mobile telecommunications standard)? 2) How consistent are respondents’ health risk perceptions relating to 5G (a) for themselves, (b) for society as a whole, and (c) for children/young people? 3) Which factors (e.g. socio-demographics, other respondent characteristics) best predict the perceived seriousness of potential health impacts of 5G mobile technologies?