
4S eSIM is a new global connectivity brand built by a team with strong experience in the telecommunications industry. Our partners provide direct network access to multiple mobile operators worldwide, giving us first-hand network resources and the ability to offer highly competitive pricing. We aim to make staying connected abroad simple, reliable, and affordable for everyone — from frequent travelers and digital nomads to business professionals and international students. With instant activation, flexible regional and global data plans, and no need for physical SIMs or complex KYC verification, 4S eSIM delivers a truly borderless mobile experience.
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Data plans for this provider are automatically updated. While we strive to keep the information accurate, we cannot guarantee its completeness or accuracy. Please confirm all details on the provider's official website or app before purchasing.
4S eSIM does not offer a truly unlimited data eSIM for Japan. All of the plans listed for Japan have a defined data cap, after which the speed is throttled to 1000 kbps. For example, the Japan 10GB Unlimited‑5 days plan allows 1 GB of high‑speed data per day and the Japan 20GB Unlimited‑5 days plan provides 4 GB per day before the reduced speed kicks in. If a user needs more data, 4S eSIM offers additional fixed‑data options such as the Japan 50GB – 30 days (IIJ) plan or longer‑term plans with 50 GB over 15 or 5 days. These fixed data plans may be more cost‑effective unless the traveler requires high‑speed data without any limits.
4S eSIM does not provide an eSIM plan for Japan that includes a phone number or SMS capability. Travelers can only purchase data‑only plans from this provider when traveling in Japan. However, you can use popular VoIP applications such as WhatsApp, Telegram, and iMessage over the data connection for calls and messaging. Note that some destinations may block or restrict certain VoIP services, so it is advisable to verify accessibility of the apps you depend on in Japan before purchasing a plan.
Japan is covered by both single‑country and multi‑country data plans from 4S eSIM, with 60 single‑country plans and 162 multi‑country plans that include Japan. The provider offers two principal plan styles: fixed‑data‑cap packages that give a set amount of data between 714 MB and 50 GB (170 plans in total) and daily‑data‑cap packages that limit daily usage (52 plans in total). All Japan‑covered plans can be purchased anywhere from roughly $1.70 to $222.18, giving customers a wide range of price and data options.
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