Chubu International Airport (Centrair) along with Narita, Haneda and Kansai International (KIX), the four biggest airports in Japan, offer smart phone, 4G pocket Wifi and iPhone SIM card rental for incoming visitors through Softbank as well as Wifi routers for outbound visitors to America, Asia and Australia.
If you need 24/7 internet access during your stay in Japan, renting a rechargeable pocket Wifi makes sense if your stay is limited to say a week or 10 days and you have brought your own PC or tablet. SIM cards for iPhone and Smart Phone rental are much cheaper ranging from a dollar or two a day respectively.
Further further information and pricing visit www.gsm-rentafone.co.jp
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