The SIM card has the best coverage among all of our products, covering 99% of the population, under Docomo network. All cities, towns, villages, and some rural areas are well covered. Some remote areas are still covered.
All our Pocket WiFi models have good coverage throughout Japan covering more than 95% of the population, so the coverage should not be a problem wherever in Japan you go. However, coverage in very remote areas with no population cannot be guaranteed.
For more details, please visit our Service Area page.