AT&T and Sprint are the main cell phone carriers and generally honor rates and calling plans just like calling from state to state while in the USVI. Other cell phone providers most likely work, but will incur nasty roaming charges.

In 2026, the "best" mobile carrier in the U.S. Virgin Islands (USVI) generally depends on whether you prioritize high-speed 5G data or wide-reaching reliability across the three main islands (St. Thomas, St. Croix, and St. John). Liberty VI (formerly AT&T's local network) remains the dominant infrastructure provider with the most extensive cell tower network, though it has faced some transition growing pains. For travelers from the mainland, T-Mobile is often cited as a top choice because it treats the USVI as "domestic" roaming, providing robust 5G speeds in urban areas like Charlotte Amalie without extra fees. Viya is the local alternative, often bundled with home internet, and provides strong localized service. While Verizon and AT&T users can roam here, they often experience slower speeds or rely on Liberty's towers. If you are staying in remote areas or sailing between the islands, Liberty typically offers the most consistent signal, but for most vacationers, a T-Mobile plan offers the best balance of speed and convenience.