nextSIM eSIM Data Plans for Japan

NextSIM’s packages titled “Unlimited” are not truly unlimited; each of them contains a fixed data cap of 1 GB or 2 GB with a reduced speed applied after the limit is reached (512 kbps for the 1 GB options and 2000 kbps for the 2 GB options). After the capped amount is used, the connection throttles to the indicated speed.

Users who need a larger data allowance can choose nextSIM’s fixed‑data plans, such as the 20 GB 30 days Japan plan or the 50 GB 30 days Premium plan, which provide full‑speed data up to the stated cap and may offer a more cost‑effective option for extended travel.

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 offers 27 single‑country data plans and 18 multi‑country plans for Japan. The plans span a price range from roughly $2.83 to $1,278.02 and data caps between 1 GB and 50 GB. Some plans provide a fixed data amount that is shared across the plan’s validity period, while others offer daily data caps that reset each day during the validity window, giving users flexibility to choose based on whether they need a steady pool of data or a consistent daily allowance while traveling in Japan.