MobineX does not offer a plan that provides truly unlimited high‑speed data for Japan. All plans that carry the word “Unlimited” in their name still have a specified data cap; after that limit is reached the speed drops to a reduced rate (for example, 128kbps or 1024kbps).  
Travelers who need a large amount of data can instead choose from mobineX’s fixed‑data plans. For instance, the Unlimited – 30 Days plan supplies 169GB of high‑speed data over 30 days, and the 100 GB – 90 days plan gives 100GB for 90 days. These options provide high‑speed data without a throttled speed and can be more cost‑effective for users who are not extremely heavy data consumers.