nextSIM eSIM Data Plans for Japan

nextSIM does not provide a truly unlimited high‑speed data plan for Japan. All plans that carry the name “Unlimited” in their title actually have a fixed data allowance; for example, the eSIM Unlimited Standard 1 Day Japan plan includes 1GB of high‑speed data, after which the speed drops to 512 kbps. Similarly, the eSIM Unlimited Plus 1 Day Japan plan allows 2GB before throttling to 2000 kbps. Because data caps exist, nextSIM offers a range of fixed‑data packages instead, such as the 20GB 30 Days Japan plan for $23.13 USD or the 50GB 30 Days Japan economy plan for $57.41 USD. These fixed options give travelers predictable, unlimited‑use high‑speed access within the allotted amount, which can be more cost‑effective for most users than repeatedly purchasing short‑term capped plans.

nextSIM does not provide an eSIM for Japan that includes a phone number or SMS service. The provider only offers data‑only plans for travelers in Japan. Users who need voice or text communication can rely on VoIP and messaging applications such as WhatsApp, Telegram, or iMessage, which work over the data connection.

nextSIM provides 29 single‑country data plans exclusively for Japan. In addition, the service offers 21 multi‑country plans that cover Japan among other destinations. These plans span a price range from roughly $2.85 to $1, 275.95 and a data cap between 1 GB and 50 GB, with validity periods from 1 to 30 days. Some plans feature daily data ceilings while others provide a fixed data allowance, giving users the option to choose how they want to manage their data usage.