Billion Connect does not provide an unlimited data eSIM for San Marrino. The available plans for the country are fixed‑data bundles, such as the 100 GB 30‑day plan, the 50 GB 30‑day plan, and the 20 GB 30‑day plan. These plans offer a set amount of high‑speed data that must be used within the specified validity period. Choosing a fixed data plan can be more cost‑effective for most travelers, unless a user requires an unlimited data allowance.