GigSky does not provide a Tonga eSIM that includes a local phone number or SMS capability. The only available Tonga eSIMs from GigSky are data‑only plans. Travelers can still use VoIP applications such as WhatsApp, Telegram, or iMessage over the data connection for voice and text, but these services are not guaranteed to work everywhere, so it is advisable to check whether the apps you need are accessible in Tonga before purchasing a plan.