Billion Connect does not provide an eSIM for Vietnam that includes a phone number or SMS capability. The available plans from this provider are data‑only and do not offer inbound or outbound voice or text services.
Travelers who need to communicate while in Vietnam can use popular VoIP applications such as WhatsApp, Telegram, or iMessage over the data connection. However, some destinations may block or limit access to certain apps or services, so it is advisable to verify that the messaging or calling apps you rely on will work in Vietnam before purchasing a plan.