nextSIM eSIM Data Plans for Japan

nextSIM does not provide a true unlimited data eSIM for Japan. All plans that contain the word “Unlimited” in their name give a fixed amount of high‑speed data—either 1GB or 2GB for a single day, or 1GB per day or 2GB per day for multi‑day periods. Once that amount is used, the connection speed drops to 512kbps or 2000kbps, so the plan is not truly unlimited.

For travellers who need more data without speed throttling, nextSIM offers fixed‑data options such as the eSIM Japan 50GB 30Days Economy plan priced at $35.60 USD and the eSIM Pro Japan 50GB 30Days Mobile Data + SMS Number at $40.68 USD. These plans provide large, uninterrupted data allocations for the full validity period.

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.