MeSIM does not provide a truly unlimited data eSIM for Sri Lanka. The plans that carry “unlimited” in their name give a fixed amount of high‑speed data per day and then throttle the speed to 384 kbps once that daily limit is reached, so the data is not unlimited.
If you need a set amount of data for your stay, MeSIM offers several fixed‑data plans that cover Sri Lanka. Examples include the Sri Lanka 50GB 30‑day plan, the Sri Lanka 50GB 180‑day plan, the Asia‑20 50GB 180‑day plan, and the Global 72‑countries 90GB/365‑day and 60GB/365‑day plans. These plans give you a specific data allowance for a defined validity period and can be more cost‑effective unless you are an extremely heavy data user.