I am not sure if this is the forum to ask about mobiles and sim cards in Japan. Please ignore if this is not appropriate.
3 adults (1 teenager) travelling to Japan from Australia to various cities from 15-30/12/2023. We have different interests and will be simultaneously exploring different parts of the cities independently.
What is the best and most economic option for mobile SIM cards to cover Tokyo, Kyoto, Osaka, Hiroshima and Narita regions?
We would like unlimited calls and sizeable data roaming on the SIM cards if possible.