Genki Mobile’s 1GB per day Travel SIM uses NTT Docomo’s network, which offers wide coverage across Japan. This makes it a good choice for travelers visiting major cities and many countryside areas.
Because it connects to a local Japanese network, travelers can usually start using data right after landing (once the SIM is inserted and settings are correct). Travelers can choose to get the SIM card delivered to the JAL ABC counter of major airports such as Narita and Haneda.