Earth Esim does not provide an unlimited data eSIM for Brunei. All of its plans for the country have a specific data cap, such as the 20GB/30 Days Brunei Darussalam 5G eSIM, the 10GB/30 Days Brunei Darussalam 5G eSIM, the 3GB/15 Days Brunei Darussalam 5G eSIM, the 2GB/1 Day Brunei Darussalam 5G eSIM, and the Orange Global eSIM with 5GB for 30 days that also covers Brunei. These are fixed data plans, meaning the data allowance must be used within the stated validity period.
Choosing a fixed data plan can be more cost effective for most travelers unless they are extremely heavy data users who would benefit from a pay‑as‑you‑go model.