eSIMCard does not provide a genuinely unlimited high‑speed data eSIM for Iceland. Every plan marketed as “Unlimited” actually caps the data at either 1 GB or 2 GB per day; once that amount is used, the speed is throttled to 512 kbps or 2000 kbps, respectively. For example, the Unlimited Data For 30Day in Iceland plan offers 1 GB/day with a reduced speed of 512 kbps after the limit, while the Unlimited Plus Data For 30Day in Iceland plan offers 2 GB/day with a reduced speed of 2000 kbps after the limit.
If a traveler needs a larger, consistent data allowance, eSIMCard offers fixed data plans. These include 50 GB for 30 days, 35 GB for 30 days, and 100 GB for 31 days. These plans give a flat data volume without a per‑day cap, and the speed remains high throughout the validity period.