eSIMCard does not offer a truly unlimited data eSIM for Brunei. The plans advertised with the word “Unlimited” actually provide a fixed amount of high‑speed data—1 GB per day for the “Unlimited Data” options or 2 GB per day for the “Unlimited Plus” options. Once that daily limit is reached the speed is reduced to 512 kbps or 2000 kbps, so the plans are not unlimited in the sense of providing unrestricted high‑speed data.
Instead, eSIMCard offers several unthrottled fixed data plans. For example, a 50 GB plan valid for 60 days costs about $558.87 USD, a 40 GB plan for 30 days is around $448.85 USD, and a 30 GB plan for 30 days is about $336.77 USD. These options provide large data allowances without throttling and may be more cost‑effective for travelers who need substantial data usage.