Brunei is unequivocally outside the domestic roaming zones for UK, US, or EU mobile network operators. Consequently, activating international roaming with your home SIM (e.g., from AT&T, Verizon, T-Mobile, or UK's Vodafone/O2) will incur their highest 'Rest of World' international roaming charges, often ranging from $10-$15 USD per day or high per-MB rates. These costs are substantially higher than a dedicated CoreESIM plan, which provides a cost-effective, local data profile.
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Does my UK, US, or EU SIM card provide free roaming in Brunei?
Updated April 22, 2026
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