Is this SouthESIM plan valid in the US Virgin Islands like St. Thomas?

It's important to note that this particular SouthESIM plan is specifically for the British Virgin Islands (BVI). The U.S. Virgin Islands (USVI), which includes islands like St. Thomas, St. John, and St. Croix, are a separate territory. If your journey includes both the BVI and USVI, you would need a different SouthESIM plan that covers the USVI, or a multi-country plan that includes both. Always double-check your plan's coverage area to ensure you stay connected seamlessly across your island-hopping itinerary!