Firsty eSIM Plans for Japan

Firsty has not published which operators it uses in Japan, so the radio side is unknown rather than bad. It has also not stated where traffic breaks out, leaving the route to locally hosted services and the apparent IP location unspecified. Its fastest listed technology is 5G, a ceiling rather than a promise. With a large range of plans, sizing is the real decision, although buying more data than a fortnight needs is a risk. Top-up is stated as available, so an exhausted plan can be extended rather than rebought.