Yes, WhatsApp, FaceTime, and other video/voice calling apps work normally over a data connection in Saint Barthélemy.
There are no known government restrictions or throttling on VoIP services like WhatsApp, FaceTime, or Skype in St. Barts. As long as you have an active data connection, you can make and receive calls, send messages, and use video chat just as you would at home. An eSIM provides reliable internet access, allowing you to stay connected with friends and family without worrying about expensive international roaming fees from your home provider.
Your eSIM will automatically connect to the strongest available major network in Saint Barthélemy, ensuring good coverage across the island. The exact network provider may vary depending on your specific eSIM plan.