nextSIM eSIM Data Plans for Japan

nextSIM does not provide a truly unlimited data eSIM for Japan. The plans that use the word “Unlimited” are actually capped, offering 1 GB or 2 GB for the entire validity period; once that amount is reached the speed drops to 512 kbps or 2000 kbps. For travelers who need more data, nextSIM offers fixed‑data plans such as the 50 GB 30 days economy plan at $57.10 USD or the 20 GB 30‑days plan at $21.67 USD, among other options. Choosing a fixed data plan can be more cost‑effective than the capped “Unlimited” options for heavy data users.

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 29 single‑country eSIM plans that include Japan, and 28 multi‑country plans that cover Japan among other destinations. Some plans have a fixed data allocation (39 of them in total) while others cap usage on a daily basis (18 of them). Across the catalog the lowest price starts around US$2.70 and the most expensive can reach about US$1, 275.50, with data caps ranging from 1 GB to 50 GB and validity periods from one day up to thirty days.