MeSIM does not offer a genuinely unlimited high‑speed eSIM plan for Iceland; every plan listed has a specific data threshold (such as 500MB/day, 1 GB/day, 2 GB/day or 3 GB/day). Once the allotted amount is used, the connection speed drops to a throttled rate (typically 384 kbps or 512 kbps).
For travellers wanting a large data allowance, MeSIM sells fixed‑data plans that can be more cost‑effective. For example, a 7‑day plan with 3 GB/day high‑speed data is available for about $11.67, and a higher‑capacity 500 GB plan for 90 days is priced at roughly $150.49. These plans also include Iceland coverage.