shibaSIM does not have a plan that provides truly unlimited high‑speed data while in Taiwan. Every plan listed for Taiwan has a fixed daily high‑speed data allowance—such as 1 GB/day or 2 GB/day for a set number of days—after which the data speed is throttled to 128 kbps.
If a larger data volume is preferable, shibaSIM offers fixed‑data bundles that remain high‑speed until the purchase amount is used. Examples include the Greater China 50 GB plan with a 30‑day validity and the Greater China 30 GB plan valid for 3 days. These options provide consistent speed without a daily cap, which can be more cost effective for heavier data users.