No, Numero eSIM does not provide an unlimited data eSIM for Serbia. All of the plans listed for Serbia have a fixed data cap, such as 20GB for 30 days, 10GB for 30 days, or 5GB for 30 days.
If a traveler needs a larger data allowance, they can choose one of the fixed data plans. For example, the Serbia 20GB for 30 Days plan offers a substantial amount of data for a month, while the Serbia 10GB for 30 Days plan provides a more modest but still useful data bundle. These fixed plans are typically more cost‑effective for most users unless they require truly unlimited data usage.