nextSIM eSIM Data Plans for Japan

nextSIM does not provide a truly unlimited high‑speed data eSIM for Japan. All of its “Unlimited” plans in the Japan market contain a specific data cap of either 1GB or 2GB, and once that limit is reached the speed drops to a reduced rate (512kbps for the 1GB plans and 2000kbps for the 2GB plans). While the plan names include the word “Unlimited, ” the data allowance is fixed, so the service is not unlimited in the typical sense.

Travelers who need more data can choose from fixed‑volume plans, such as the eSIM Japan 50GB 30Days Economy, which offers 50GB of high‑speed 5G data for 30 days. Fixed data plans often provide a more predictable and cost‑effective option unless a user expects to consume very high amounts of data before the cap 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 offers 74 single‑country plans and 28 multi‑country plans for Japan. The catalogue includes both fixed‑data plans—84 in total—and daily‑cap plans—18 in total—providing variety for travelers who need specific usage limits. Prices range from $2.80 to $1, 295.03, while data caps span 1 GB up to 50 GB, and validity periods extend from 1 day to 365 days.