eSIMatrix currently does not provide an unlimited data eSIM plan for Serbia.
Travelers who need a large data allowance can choose one of eSIMatrix’s fixed‑data options. For example, the Serbia 20 GB plan is available for 30 days at $28.50 USD, while the Balkans 20 GB plan can be purchased for 5, 10, 15, or 30 days at prices ranging from $58.00 USD to $70.50 USD. These fixed data plans offer a cost‑effective alternative unless a user requires extremely heavy data usage, in which case an unlimited plan might be more suitable.