Is roaming free in Liechtenstein with my European (EU) or Swiss SIM card?

It is complicated. Liechtenstein is part of the EEA (European Economic Area), so technically EU "Roam Like at Home" rules often apply. However, because Liechtenstein shares a customs and telecom union with Switzerland (which is NOT in the EU), signal hopping can occur, leading to accidental Swiss roaming charges for EU citizens. For travelers from the UK, USA, or Asia, roaming is definitely not free. A Cellesim Liechtenstein eSIM is the safest way to ensure a fixed cost without worrying about complex border network switches.