FullBars does not provide an unlimited‑data eSIM plan for Montenegro. All plans listed by the provider for the country feature a specified data allowance and a defined validity period, with the largest being 20 GB for 30 days.
If you need a sizeable data allocation, FullBars offers fixed data plans such as the Montenegro 20 GB · 30 days or the Montenegro 10 GB · 30 days, both of which provide consistent coverage and can be more cost‑effective than using a Pay‑as‑you‑go approach for heavy data users.