No, gosimless does not provide an unlimited data eSIM plan for Serbia. All plans listed for the country have fixed data allowances, such as the Serbia 20GB – 30 Days plan and the Europe 50GB – 180 Days plan, which cover Serbia along with other destinations.
Choosing a fixed data plan can be more cost effective for most travelers, unless the user requires very high data usage. For example, the Serbia 20GB – 30 Days plan offers 20GB of high‑speed data for 30 days at $17.49 USD, while the Europe 50GB – 180 Days plan provides 50GB for 180 days at $91.49 USD. Both options give a clear data cap and validity period.