Billion Connect does not provide an eSIM plan for Taiwan that includes a local phone number or SMS capability. Travelers who use Billion Connect will receive only a data‑only eSIM. To make calls or send messages, users will need to rely on internet‑based VoIP applications such as WhatsApp, Telegram, or iMessage, which can generally be used over the data connection. However, some destinations may block or restrict access to certain VoIP services, so travelers should confirm that the apps they depend on are available in Taiwan before purchasing.