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Background: Due to the societal, economic, and health costs of COVID-19 non-pharmaceutical interventions (NPIs), it is important to assess their effects. Human mobility serves as a surrogate for human contacts and compliance to NPIs. In Nordic countries, NPIs have mostly been advised and sometimes made mandatory. It is unclear if making NPIs mandatory further reduced mobility. Aim: We investigated the effect of non-compulsory and follow-up mandatory measures in major cities and rural regions on human mobility in Norway. We identified NPI categories that most affected mobility. Methods: We used mobile phone mobility data from the largest Norwegian operator. We analysed non-compulsory and mandatory measures with before-after and synthetic difference-in-differences approaches. By regression, we investigated the impact of different NPIs on mobility. Results: Nationally and in less populated regions, follow-up mandatory measures further decreased time, but not distance travelled. In urban areas, however, follow-up mandates also decreased distance, and the effect exceeded that of initial non-compulsory measures. Stricter metre rules, gyms closing and reopening, restrictions on guests in homes, and face mask recommendations most impacted distance travelled. Time travelled was most affected by gyms closing and restaurants and shops reopening. Conclusion: Overall, non-compulsory measures appeared to decrease distance travelled from home, while mandates further decreased this metric in urban areas. Time travelled is reduced more by mandates than by non-compulsory measures for all regions and interventions. Stricter distancing and restricted number of guests were associated with decreases in mobility.