eSIMCard does not offer a truly unlimited high‑speed data eSIM for the United Kingdom. All plans that carry “Unlimited” in their name are in fact capped at 1 GB per day (or 2 GB per day for the “Unlimited Plus” variants) and the speed is reduced after the cap is reached – for example, 512 kbps after 1 GB or 2000 kbps after 2 GB of data.
Travelers who need more data can choose from fixed‑data plans, such as the 50 GB plan valid for 30 days or the 35 GB plan also valid for 30 days. These provide larger data allowances and remain at full speed throughout the validity period. Choosing a fixed‑data plan is often more cost‑effective unless a user is an extremely heavy data consumer.