JamboSim eSIM Data Plans for Japan

JamboSim does not provide a genuinely unlimited data eSIM for Japan. Plans that carry the word “Unlimited” in their title only allow 3GB of high‑speed data per day; after that limit the speed is reduced to 1000 kbps.

Travelers who want higher data volumes can choose from fixed‑data plans. For example, JamboSim offers a Japan 20GB / 30 days plan for $11.99 USD, which includes 5G coverage and tethering, and a larger JamboSim Asia 100GB / 180 days plan for $69.99 USD if a longer stay or high usage is required. Fixed‑data options can be more cost‑effective unless a user is an extremely heavy data consumer.

JamboSim sells Japan eSIM plans that include a phone number and the ability to send SMS. The plans range in price from $11.99 USD for 1GB over 7 days up to $101.99 USD for 20GB over 365 days. All listed plans deliver a phone number with dialing code +1, which is a U.S. number, not a local Japanese number. The telephony features allow outbound voice calls and outbound SMS; incoming calls and SMS are not supported. For the exact limitations of each order, users should confirm details directly with JamboSim.

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.