GigSky does not sell an eSIM for Montenegro that includes a phone number or SMS capability. The only plans it offers for Montenegro are data‑only, which provide high‑speed internet but no inbound or outbound voice or text services. Travelers who need to make calls or send messages can generally rely on VoIP applications such as WhatsApp, Telegram, or iMessage over the data connection, though some destinations may block or restrict access to particular apps, so it is wise to confirm that the required services will work in Montenegro before purchasing a GigSky plan.