Guide to Japanese SIM Cards for Travelers - Japan Web Magazine
Amazon.com: Japan Travel Prepaid SIM Unlimited Docomo Data Only (No Voice/SMS) 3-in-1 Docomo SIM Card (Docomo Network) Tethering, Japan No Activation No Contract (16Days) : Cell Phones & Accessories
How to Choose Japan Travel Mobile Data/ Voice Plan for Tourist - SIM, eSIM, Pocket WIFI - YouTube