Voyasim does not offer an eSIM plan for Zambia that includes a local phone number or SMS capability. Travelers can only purchase data‑only eSIMs from Voyasim for Zambia, and they would need to rely on VoIP services such as WhatsApp, Telegram, or iMessage for calls and messaging. However, because some destinations may block or restrict certain VoIP apps, travelers should verify that the services they depend on are accessible in Zambia before buying the data plan.