aloSIM eSIM Data Plans for Japan

aloSIM does not provide an unlimited data eSIM plan for Japan. Instead, the service offers fixed‑data options that vary in size and validity. For example, a 100GB 5G plan is valid for 180 days and costs $185.00 USD, while a 50GB 5G plan is valid for 90 days and costs $100.00 USD. These fixed plans may be more cost‑effective for most travelers unless extremely heavy data usage is anticipated.

aloSIM does not provide a Japan eSIM that includes a phone number or SMS capability. All of their Japan plans are data‑only, offering high‑speed internet with no inbound or outbound voice or text services. Travelers who need to make calls or send messages can use popular VoIP apps such as WhatsApp, Telegram, or iMessage, which operate over the data connection.

The provider has 12 single‑country data plans that cover Japan, and 19 multi‑country plans that include Japan within their coverage. These plans span a price range from $4.50 to $185 USD and offer data caps between 1 GB and 100 GB, with validity periods from 3 to 180 days. Some plans use a fixed data amount while others use a daily data cap; the fixed plans give a set amount of data for the entire validity, whereas the daily plans cap the amount of data usable each day. Reduced‑speed options are available on a few plans, limiting speed to 500 kbit/s after a certain data threshold.