Does EU 'Roam Like at Home' apply in French Guiana for CoreESIM users with a European SIM?

While French Guiana is an overseas department of France and thus technically part of the EU, the application of 'Roam Like at Home' (RLAH) for non-French EU carriers can be complex. Many EU operators outside of France (e.g., from Germany, Spain, Italy) impose fair usage policies or specific surcharges for extended roaming in overseas territories to prevent 'permanent roaming'. CoreESIM advises verifying directly with your domestic carrier or opting for a dedicated French Guiana eSIM for predictable data costs and optimal performance.