simpleSIM does not provide a truly unlimited data eSIM for the United Kingdom. Every plan that carries the word “Unlimited” in its name actually offers 1GB of high‑speed data (or 1GB per day for multi‑day plans) and reduces the speed to 512kbps once that limit is reached. Because of the hard data cap, these plans are not unlimited in the sense of giving unrestricted high‑speed data.
Instead, simpleSIM sells fixed data plans that give larger amounts of high‑speed data for a set period. For example, a 20GB plan is valid for 30 days, and a 50GB plan is also available for 30 days. These fixed plans are more cost‑effective for travelers who need substantial data and are not heavy data users.