AlpineSIM eSIM Data Plans for Japan

AlpineSIM does not provide a plan that offers unrestricted high‑speed data for Japan. All of the plans that carry “Unlimited” in their name actually limit usage to a set amount of data per day—such as 500 MB/day or 1 GB/day—and after that limit the speed is throttled, which is not truly unlimited.

Instead, AlpineSIM sells fixed data plans that give travelers larger allowances. For example, a 50 GB plan is available for 30 days or 180 days at $25.17 USD and $41.47 USD respectively, and a 20 GB plan is offered for 30 days at $12.17 USD. These fixed‑data options allow more data consumption than the “Unlimited” plans and can be a more cost‑effective choice for most visitors.

AlpineSIM does not provide a Japan eSIM that includes a local phone number or SMS capability. Travelers using AlpineSIM plans for Japan will only receive high‑speed Internet data; voice and text messaging must be handled through data‑based services such as WhatsApp, Telegram or iMessage. This approach allows connectivity without a traditional Japanese phone number, while still enabling communication via popular VoIP applications.

AlpineSIM lists 10 single‑country data plans that are dedicated to Japan, plus 136 multi‑country plans that include Japan as part of their coverage area. Prices for these plans start around 0.44 USD and can go up to 264.52 USD, while data caps range from 100 MB to 50 GB. Some plans offer a fixed data allowance for the entire validity period, whereas others limit the amount of data that can be used each day.