While the concept of a totally "free data eSIM" for Sri Lanka is generally not available, some providers offer free data trials or very small amounts of free data to new users to test their service. For example, in Sri Lanka, you might find options from Roamless, GigSky, and Firsty that fall into this category, allowing you to experience basic connectivity before committing to a paid plan. These are typically not robust enough for extensive use, but can be convenient for initial navigation or messaging upon arrival.
For most travelers to Sri Lanka seeking reliable connectivity, purchasing a dedicated Sri Lanka eSIM or a regional plan with a reasonable data allowance is the most practical and cost-effective solution. These paid options offer stable connections and sufficient data for popular activities like using navigation apps, staying in touch with family, or browsing online, ensuring a seamless experience throughout your trip without unexpected data charges.