Will my US or UK/Canadian SIM card offer free roaming in Barbados for my group?

Unfortunately, no, using your regular US (e.g., AT&T, T-Mobile) or UK/Canadian SIM card in Barbados will likely lead to very expensive international roaming charges. Barbados is an independent nation and isn't typically included in standard domestic plans from these regions. Your home carrier will charge per MB, per call, and per text, which can quickly add up for a group trying to coordinate. Triply offers a much more cost-effective and predictable way for everyone in your party to stay connected without bill shock.