Billion Connect does not offer an eSIM plan for Bulgaria that includes a phone number or SMS capability. The provider only sells data‑only eSIMs for Bulgaria.
Travelers who need voice and messaging can rely on VoIP apps such as WhatsApp, Telegram, or iMessage over the data connection, but some destinations may block or restrict these services, so it is advisable to check that the apps you rely on are accessible in Bulgaria before buying a plan.