AloOui eSIM Data Plans for Japan

AloOui does not provide a truly unlimited data eSIM for Japan. The plans branded with “Unlimited” in their names actually offer a fixed daily allowance, such as 1 GB per day or 2 GB per day, after which the connection is throttled to 512 kbps, 1.25 Mbps, or 2 Mbps.

If a traveler needs more data, AloOui offers full‑data plans like 100 GB for 30 days or 50 GB for 30 days. These fixed‑data options give a larger upper limit and can be more cost‑effective for users who anticipate heavy usage.

AloOui does not offer any Japan eSIM plan that includes a phone number or SMS capability. Travelers can only purchase data‑only eSIMs from AloOui for use in Japan. VoIP services such as WhatsApp, Telegram, and iMessage can generally be used over the data connection for calls and messaging, but availability of these apps may vary in Japan, so it is advisable to confirm they work for the traveler’s needs before buying.

AloOui offers a substantial selection of eSIM data plans for travel in Japan, featuring both single‑country and multi‑country options. In Japan the catalogue includes 26 single‑country plans, allowing travelers to purchase a dedicated Japan data package, and 27 multi‑country plans that cover Japan along with other destinations.

The plans vary by data quota and price. Across the portal, prices range from about $4.54 for the smallest data caps up to $493.26 for the largest offers, with data limits spanning from 1 GB to 100 GB. Some offerings feature a fixed data cap—where a set amount of data is available for the duration of the validity period—while others impose a daily data cap, limiting the amount of data you can use each day. Both structures are available in the Japanese market, giving customers flexibility depending on their usage patterns.