No, MeSIM does not provide a plan that offers truly unlimited high‑speed data for Tonga. All plans that include “unlimited” in the name are fixed data plans that give a daily allowance—such as 500 MB/day, 1 GB/day, 2 GB/day—and after the daily limit is reached the speed is throttled to 384 kbps.
Travelers who need a large amount of data can choose from fixed data plans that give a set amount of high‑speed data for a set period, such as the Tonga 20GB 30Days plan, the Oceania (8 areas) 20GB 30Days plan, or the Oceania (8 areas) 10GB 30Days plan. These plans may be more cost‑effective for heavy data users than the daily‑limit options.