Stability is paramount! Ideal for those who need a stable connection, even if it costs a little more!
Main line: Docomo network (NTT Docomo or ahamo)
The network quality is extremely stable, and there’s a high probability of communication even in basements or deep inside buildings.
In particular, “Docomo’s main network” is highly recommended if stability is your priority, as it provides good connectivity even in mountainous areas and suburbs.
Docomo MAX: 3GB to unlimited data, 7,680 yen (8,448 yen including tax)
*New pricing plan from June 5, 2025
Voice call charges: 22 yen (including tax) per 30 seconds for domestic calls.
Secondary line: IIJmio (au network)
Among budget SIMs, it offers high stability. IIJmio, in particular, offers the option of using either the Docomo or au network!
2GB: 773 yen (850 yen including tax)
5GB: 864 yen (950 yen including tax)
*Discounts available through other campaigns. As of May 2025. Based on our own research.
