AeroSims does not offer a true unlimited data eSIM for Mongolia. All of the plans listed for the country have a fixed data cap; even the products with “Unlimited” in the name provide 2 GB per day and impose a speed reduction to 1000 kbps once the cap is reached, so the data volume is limited.
For travelers who need a larger amount of data, a fixed‑data plan such as the Mongolia 20 GB / 30 days (priced at $72.00) or the Mongolia 10 GB / 30 days (priced at $38.27) is available. These plans give the indicated amount of data for a 30‑day validity period and remain usable until the data is exhausted, making them a cost‑effective choice for heavy‑usage users.