Roamingo does not provide a truly unlimited high‑speed data plan for the Czech Republic. The only plan that carries “Unlimited” in its name—Europe Unlimited for 1 day—offers 2 GB of high‑speed data, after which the speed would reduce according to their normal throttling rules (the exact reduced speed is not listed).
For travelers who need more data, Roamingo offers fixed data plans. For example, the Czechia 20GB for 30 days plan covers 20 GB of high‑speed data and is available for 25.50 USD, while the Europe 10GB for 30 days plan gives 10 GB for 16.40 USD. Choosing a fixed‑data option can be more cost‑effective unless a user expects to consume data well beyond these limits.