Benefit #1: Maximum Coverage in Japan

With a PrimaSIM eSIM you get access to several of Japan’s top mobile networks, including NTT Docomo, KDDI (au), SoftBank, and Rakuten Mobile. This ensures the widest possible coverage across the country, as some networks perform better in certain areas. For example, one may have stronger coverage in the Tohoku region, while another reaches remote villages in Shikoku. 3G and 4G networks are available even in many rural and scenic areas, such as the temples and forests of Nikko in Tochigi Prefecture and the hiking trails around Mount Fuji. High-speed 5G is especially strong in major cities such as Tokyo. 

Benefit #2: Fast Mobile Internet via travel eSIM in Japan

The average mobile internet speed in Japan ranges from 43.8 Mbps (Rakuten) to 55.8 Mbps (AU). Uploads typically vary between 6.6 Mbps and 15.9 Mbps. Rakuten generally performs best across most areas, but NTT Docomo offers the widest coverage and the fastest 5G network with user ratings averaging 9.1 out of 10.

Benefit #3: Access to High-Speed 5G Networks

High-speed 5G is available in all 47 prefectures, although whether you get 4G or 5G depends on your exact location. The strongest 5G coverage is found in Tokyo, Osaka, Yokohama, Nagoya, Sapporo, and Fukuoka. Average 5G download speed ranges from 141.1 Mbps (SoftBank) to 168 Mbps (NTT Docomo).