ETravelSim does not provide a true unlimited data eSIM for Japan. The plans that include “Unlimited” in their name actually allow 4 GB per day; once this limit is reached, the speed is reduced to 128 kbps, so the data is not high‑speed unlimited.
For travelers who need larger data allotments, fixed‑data plans are available. For example, Tokyo eSIM – WAC 2025 Special 50 GB – 30 days provides 50 GB of high‑speed data for 30 days, and Travel eSIM for Asia 50 GB – 30 days offers the same amount of data. Choosing a fixed‑data plan can be more cost‑effective unless a user requires high‑speed data beyond the 4‑GB‑daily cap.