RedEx eSIM does not provide an eSIM for Saint Martin that includes a phone number or SMS capability. The available plans are strictly data‑only, so travelers will need to rely on internet‑based VoIP or messaging services such as WhatsApp, Telegram, or iMessage to make calls or send messages. Those apps normally work over the data connection, but some destinations may block or restrict access to specific services, so users should check that the applications they rely on are reachable in Saint Martin before purchasing a plan.