JamboSim eSIM Data Plans for Japan

JamboSim does not provide a truly unlimited high‑speed eSIM plan for Japan. The plans that carry “Unlimited” in their names actually grant 3GB of data per day and, once that daily cap is reached, the data speed is throttled to 1000kbps.

Instead, JamboSim offers fixed‑data eSIM options that may better suit heavy data users. For example, the 20GB/30‑day plan costs $11.99 USD when purchased from JamboSim Japan (and $10.99 USD through the Asia‑wide package) and the 100GB/180‑day plan is available for $71.99 USD through JamboSim Asia. These fixed data plans avoid throttling and can be more cost effective for travelers who need extensive data while in Japan.

JamboSim sells Japan eSIM plans that include a phone number and outbound SMS capability. The available plans range in data cap from 1GB to 20GB, in validity from 7 days up to 365 days, and in price from $11.99 USD to $105.99 USD. The phone numbers use the +1 dialing code, meaning they are not local Japanese numbers. Call and SMS features are outbound only: calls can be made and SMS can be sent, but incoming calls and messages are not supported.

If users need to be certain that a plan meets specific needs for voice or messaging, they should contact JamboSim directly to confirm the details.

JamboSim offers 12 single‑country data plans and 33 multi‑country plans that include Japan. The single‑country options provide a fixed amount of data, ranging from 200 MB up to 100 GB, with prices between roughly $1.99 and $94.99 and validity periods from 3 to 365 days. The multi‑country catalog also covers the same price and data cap range but allows the data to be used across several destinations, with many plans specified as daily data caps that reset each day while others remain fixed for the entire validity. Overall, customers can choose from a broad spectrum of data allocations priced from under two dollars to nearly a hundred dollars, depending on the desired data volume and duration.