Does my existing UK, US, or non-French EU SIM card offer free roaming in Réunion?

Navigating roaming in Réunion can be tricky. While EU citizens theoretically benefit from 'Roam Like at Home' (RLAH), many non-French EU carriers apply strict 'Fair Use Policies' for overseas territories, often throttling speeds or imposing caps. For UK and US SIM cards, expect significant international roaming charges, often reaching $10-$15 per day, which can quickly deplete your adventure budget. An eSIMAdventures plan provides clear, predictable data costs, ensuring you're not caught off guard by unexpected bills while exploring Réunion's stunning landscapes, from Piton de la Fournaise to the 'Cirques'.