Roameer does not provide an unlimited data eSIM for Montserrat. The available plans are fixed data bundles that must be used within a set validity period. For example, Roameer offers a 20GB plan valid for 30 days at $99.84 USD, a 10GB plan valid for 30 days at $52.06 USD, and a 5GB plan valid for 30 days at $29.71 USD. All of these plans include tethering and are specifically for Montserrat.
Choosing a fixed data plan can be more cost‑effective for most travelers, unless you anticipate consuming data at a very high rate. The fixed plans give you a clear data allowance and a defined validity window, while an unlimited plan is not available from Roameer for Montserrat.