Simology eSIM Data Plans for Japan

Simology does not provide a true unlimited data eSIM for Japan. Its plans labelled “Unlimited” give 1GB per day at full speed, after which the connection remains active but is throttled to 1 Mbps for the rest of the validity period. If you need higher data volumes without a daily cap, Simology offers fixed‑data plans such as 50 GB for 30 days, 20 GB for 30 days, or 10 GB for 30 days, all with 5G coverage across Japan.

Simology does not offer any Japan eSIM plans that provide a phone number or support SMS. All available Japan eSIMs from Simology are data‑only. Travelers who need voice or text services can use popular VoIP applications such as WhatsApp, Telegram, or iMessage over the data connection, though some destinations may block or restrict these services. Users should confirm the availability of the apps they rely on in Japan before making a purchase.

Simology offers 13 single‑country plans and 13 multi‑country plans for Japan. The available plans span a price range from about $3.47 to $87.14 and data caps between 1 GB and 50 GB, with validity periods of 3 to 30 days. Some plans provide a fixed data amount that is available for the entire validity period, while others use a daily data cap that resets each day, giving customers flexibility depending on whether they prefer a set amount of data for the whole period or a daily allowance that can be used more flexibly.