Travel info - Prepaid sim cards and rental mobile phones

Prepaid sim cards and rental mobile phones are available at the airports. The websites below (GetAroundJapan) provides detailed information. The airports' official websites also give us some useful information about sim cards

Narita (NRT) airport in Tokyo: Prepaid sim cards

Narita (NRT) and Haneda (HND) airports in Tokyo are: voice sim cards

Narita (NRT) airport in Tokyo are: information on the official website

Haneda (HND) airport in Tokyo area: information on the official website

Kansai (KIX) international airport in Osaka area 

Chubu (NGO) Centrair international airport in Nagoya area