nextSIM eSIM Data Plans for Japan

nextSIM does not provide a truly unlimited data eSIM for Japan. Plans that carry “Unlimited” in the name actually give a fixed daily amount of high‑speed data—1GB for the standard options and 2GB for the Plus options—and once that limit is reached the speed drops to a reduced rate (512kbps or 2000kbps).

For travelers who need a larger data allowance, nextSIM offers fixed‑cap plans such as the 50GB 30‑day Economy or the 50GB 30‑day Pro plans. Both provide 50GB of high‑speed data for 30 days without any throttling after the quota 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.