Jetpac does not provide a truly unlimited high‑speed eSIM for Japan. The plans that carry “Unlimited” in their name actually give a fixed daily allowance of 3 GB; once the daily quota is used, the speed is reduced to 1 Mbit/s. This means the data is capped, not unlimited, and after the limit the connection will be throttled.
If a higher or fixed data allowance is preferable, Jetpac offers several flat‑rate options. For example, a 30 GB plan for Japan is available for $29.99 USD and a 40 GB plan for the same country is priced at $34.99 USD. These plans provide full‑speed data up to the stated limit and can be more cost effective than consuming large volumes on a capped plan, unless you expect to use more data than the 3 GB/day cap allows.