Yes, WhatsApp, FaceTime, and other video/voice calls work normally over mobile data in Saint Martin without any restrictions.
You can freely use popular communication apps like WhatsApp, FaceTime, Skype, and Zoom for both voice and video calls while traveling across Saint Martin. The island does not impose any known restrictions or blocks on these Voice over IP (VoIP) services, so your calls will function just as they would at home, provided you have a stable internet connection.
An eSIM provides a convenient way to ensure you have reliable mobile data throughout your trip. It automatically connects you to the strongest available major network on the island, allowing you to stay connected with friends and family without relying on public Wi-Fi or incurring expensive roaming charges. The exact network your eSIM connects to can vary by plan, but the goal is always to provide optimal coverage for your communication needs.