AlpineSIM eSIM Data Plans for Japan

AlpineSIM does not offer a true unlimited‑data eSIM specifically for Japan. The plans that carry an “Unlimited” name in the catalogue are actually capped – they provide a fixed amount of high‑speed data such as 500 MB/day, 1 GB/day, or 2 GB/day and the speed is reduced once the limit is reached.

Instead, AlpineSIM sells fixed‑data Japanese eSIMs that give a set amount of data for a set period. For example, the AlpineSIM Japan eSIM – 20 GB is valid for 30 days at $12.35 USD, while the AlpineSIM Japan eSIM – 50 GB is available for 30 days at $25.55 USD or for 180 days at $42.09 USD. These fixed‑data options are more cost‑effective for most travelers who need reliable, high‑speed data in Japan.

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 offers 10 single‑country plans that target Japan alone, and an additional 136 multi‑country plans that include Japan in their coverage.
The single‑country plans are primarily fixed‑data plans, ranging from 100 MB to 50 GB for prices between about $0.46 and $268.27, and they are valid from 1 to 365 days.
Multi‑country plans provide a mix of fixed‑data and daily‑cap options (84 plans with daily caps and 62 with fixed caps). The data caps on these vary from the smallest 100 MB bundles to the largest 50 GB bundles, and pricing spans the same $0.46‑$268.27 range.