Is using my existing UK, US, or EU SIM for roaming in Brunei a cost-effective choice, or should I consider Truly Roaming?

Roaming in Brunei with your existing UK, US, or EU SIM is generally not cost-effective. Brunei is not included in typical domestic or EU roaming plans. Most home carriers, such as AT&T, Verizon, T-Mobile, or UK providers like Vodafone/O2, will apply their highest "Rest of World" international roaming rates, which can quickly accumulate to $10-$15 per day or more. Truly Roaming provides a predictable, budget-friendly data solution, ensuring you stay connected for work without unexpected, exorbitant charges.