Does EU roaming apply in Mayotte for European SIM cards?

The applicability of EU 'Roam Like at Home' in Mayotte for European SIM cards is nuanced. As a French Overseas Department (DOM), Mayotte is technically within the EU roaming zone. However, many European mobile network operators (MNOs) implement Fair Use Policies for their 'Restricted Ultra-Peripheral Regions' (RUP) or overseas territories, which can significantly limit data allowances or impose speed throttles. Users should consult their specific carrier's terms for Mayotte, as data usage beyond these often-low thresholds typically incurs substantial out-of-bundle charges.