Flysimio does not provide a truly unlimited data eSIM for Mongolia. The plan labeled “Mongolia Unlimited” offers a 2GB/day allowance for a 7‑day period, which is a fixed data plan rather than an unlimited one. Travelers who need more data can choose from Flysimio’s fixed data plans such as the 20GB 30‑day, 10GB 30‑day, 5GB 30‑day, 3GB 15‑day, or 3GB 30‑day options, all of which provide a set amount of high‑speed 4G data that must be used within the specified validity period. These fixed plans can be more cost‑effective for most users, while the “Mongolia Unlimited” plan remains a capped daily allowance rather than an unlimited data option.