AlpineSIM does not offer a truly unlimited high‑speed data eSIM for Montenegro. All of its Montenegro‑specific plans have a fixed data cap, ranging from 500 MB per day to 20 GB for 30 days. Plans that carry the word “Unlimited” in the name still contain a specified cap and, once that cap is reached, the speed would be reduced (the reduced speed is not listed in the data provided).
If a traveler needs a larger data allowance, AlpineSIM does provide fixed‑data alternatives. For example, a 10 GB high‑speed data plan valid for 1 day costs $5.35 USD, and a 20 GB plan valid for 30 days costs $18.69 USD. These fixed‑data options can be more cost‑effective for users who expect heavy data usage, especially when an unlimited plan does not actually provide unlimited data.