nextSIM eSIM Data Plans for Japan

nextSIM does not provide a truly unlimited data eSIM for Japan. All plans branded “Unlimited” in the nextSIM catalog actually include a fixed data allowance that, when exceeded, causes the speed to drop to a reduced rate (for example, 512kbps or 2000kbps). Travelers who need more data can choose from fixed‑data options such as the 20GB 30Days Standard plan or the 50GB 30Days Economy plan, which offer higher data caps without requiring a speed reduction after the limit is reached.

nextSIM does not provide an eSIM plan with a local phone number or SMS capability for Japan.
Only data‑only eSIMs are offered, which allow internet access on 4G or 5G networks.
Travelers can still use VoIP applications such as WhatsApp, Telegram, or iMessage over the data connection to make calls and send messages.

NextSIM lists 73 single‑country plans for Japan and 28 multi‑country plans that include Japan. Among the total offerings, 18 plans cap data on a daily basis, allowing a set amount of data each day within the validity period, while 83 plans provide a fixed data amount that can be used throughout the plan’s validity. Prices for Japan plans range from roughly $2.74 to $1, 264.89, and data limits span from 1 GB to 50 GB across the available options.