LEO satellite constellations have the potential to provide connectivity in geographic areas which are hard to reach with fixed and terrestrial mobile infrastructure and also to provide services in jurisdictions with limited infrastructure. However, the operators of satellite constellations potentially face numerous legal challenges before they could be seen as significant competitors to terrestrial telecommunications infrastructure providers. Satellite constellations are subject to complex spectrum allocation, filing and coordination proceedings at international level and, subsequently, also to national spectrum assignment proceedings in order to become operational and enter the market. National security and cyber security risks, as well as potential requirements to comply with existing telecommunications infrastructure regulation, are also issues to be considered by LEO satellite operators and service providers.