Global Connection, Inc. Original "AJC (All Japan Communications) All Japan Prepaid SIM Card" is a SIM card dedicated to data communication that can be used in Japan. Contracts, cancellation, return of cards etc are unnecessary, so it is very popular item in recently inbound (tourist visiting Japan). Of course, even those living in Japan can use it for domestic travel or business trips. High speed communication 4G / LTE line is compatible so you can use it anywhere in Japan.