nextSIM does not offer a truly unlimited data eSIM for Montenegro. Every plan listed for Montenegro under nextSIM has a fixed data allowance, the largest being 2GB for a one‑day period, and after that limit the connection speed is reduced to either 512kbps or 2000kbps. The use of “Unlimited” in the plan names refers to the absence of a hard cap within the validity period but does not mean endless high‑speed data.
For travelers seeking a clear data limit, nextSIM provides several fixed‑data options. For example, the eSIM Unlimited Plus 1 Day Montenegro plan gives 2GB for $8.53 USD, while the eSIM Unlimited Standard 3 Days Montenegro plan supplies 1GB per day for $7.82 USD. These fixed‑data plans may be more cost‑effective for heavy data users because the allowance is explicitly defined and no additional throttling beyond the specified reduced speed occurs.