Ubigi does not provide an unlimited data eSIM plan for Tonga. The largest fixed‑data options from Ubigi for Tonga give 200 GB for 360 days or 60 GB per month at $88.00 USD. These plans are fixed data bundles that must be used within their validity window.
If a traveler needs a large amount of data without a strict time limit, a fixed data plan such as the 200 GB 360‑day bundle may be more cost‑effective than upgrading to a Pay‑as‑you‑go credit. For light users, the 60 GB/month plan offers a lower initial cost, though it reduces speed after 2000 kbps when the 60 GB cap is reached.