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 provides a range of data‑only eSIMs for travelers heading to Japan. For Japan specifically, the carrier offers 13 single‑country plans that allow a user to stay in Japan alone. In addition, JamboSim also supplies multi‑country plans that cover Japan as part of a broader itinerary; 58 such multi‑country options are available.

These plans span a budget from about $1.99 to $125.99, with data limits that start around 200 MB and increase up to 100 GB. Some plans feature a fixed data amount for the entire validity period, while others reset daily, giving a daily data cap that can be useful for short stays or flexible usage. The overall selection enables travelers to pick the plan that best matches their stay length, data needs, and budget.